Heat Exchangers
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9M96411104205KIT
Product Information
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Related, superseded, cross reference or alternative numbers for comparison.
9M96411104205KIT
The product you are viewing cross references to these numbers
Product Information
Catalytic converter repair flanges and mounting hardware kit
Fits:
Porsche 964 (911) C2 1989-93
Porsche 964 (911) C4 1989-93
Porsche 964 (911) RS 3.6L 1991-93
Porsche 964 (911) RS 3.8L 1991-93
Kit Includes
2 x Catalytic converter / heat exchanger cross over flange
1 x Catalytic converter gasket
1 x Heat exchanger gasket
6 x Heat exchanger to cylinder head seal ring
4 x Heat exchanger barrel nut
16 x Exhaust lock nut
8 x Exhaust bolt M8 x 40
Ninemeister Converter Repair Flange
Over time, age, heat cycles, and corrosion take their toll on Porsche exhaust systems. A common weak point is the catalytic converter flange, which can corrode and eventually disintegrate. When this happens, it compromises the seal in your exhaust system, leading to exhaust leaks, loss of performance, and increased noise.
The Ninemeister repair flange is a high-quality replacement solution designed specifically to restore your Porsche’s exhaust integrity.
Key Features
- Direct
Repair Solution – allows you to remove the corroded flange and re-weld
this precision-machined replacement in place.
- Durable
Construction – built to withstand the extreme heat and corrosive
conditions of Porsche exhaust systems.
- Restores
Exhaust Sealing – eliminates leaks, restores back pressure, and
ensures smooth engine performance.
- Cost-Effective
Repair – no need to replace the entire catalytic converter when only
the flange is damaged.
- Tailored Fitment – engineered to match Porsche specifications for proper alignment and fit.
Why Replace a Corroded Converter Flange?
- Eliminate
Exhaust Leaks – prevent harmful gases from escaping and affecting
cabin safety.
- Restore
Performance – exhaust leaks reduce back pressure, causing poor
throttle response and reduced efficiency.
- Prevent
Further Damage – corrosion at the flange can spread, leading to costly
catalytic converter or exhaust system replacements.
- Long-Term Reliability – a fresh flange ensures your exhaust remains structurally sound for years to come.
The Ninemeister catalytic converter repair flange provides a reliable, cost-effective fix for corroded catalytic converter
flanges, helping you keep your Porsche exhaust system safe, efficient, and true
to factory performance.
Section of diagram ref no 1, 3, 4, 5, 6, 7, 8 and 12.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
9M96411104205KIT
96411104205
96411321310
96411321306
96411321316
96411321317
96421103905
96421103932
The product you are viewing cross references to these numbers
About kit
This kit is comprised of the following items:
2 x Catalytic converter repair flange. Porsche 964 C2 / C4 / RS (9M96411104205
6 x Exhaust seal ring for heat exchangers. Porsche 964 / 993 (99311119500/1
8 x Exhaust bolt M8 x 40, Standard bold. Porsche 911 1974-89 (90007428202/1
1 x Exhaust gasket. Porsche 964 1990-94 (96411119800/1
4 x Exhaust hexnut for heat exchanger. Porsche 911 1965-89 (99908500103/1
16 x Exhaust Lock Nut for Bolt. Porsche 964 (99908405202/1
1 x Heat exhanger to crossover pipe gasket. Porsche 964 C2 / C4 (96411119205/1
Vehicle Group
Vehicle Group
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 964 (911) RS 3.6L 1991-93
- Porsche 964 (911) RS 3.8L 1991-93
€225.29 inc. VAT
Now €211.93 inc. VAT
Due In 30+ Days
99311119500/1KIT
Product Information
3 required per side
This exhaust seal ring is designed for Porsche 964 and 993 models, replicating the original gasket’s fit, function, and durability. It provides a gas-tight seal between the exhaust manifold or heat exchanger and the cylinder head, restoring quiet, leak-free, and efficient exhaust performance.
Fits:
Porsche 964 C2 / C4 / Carrera RS 1989-94
Porsche 993 Carrera / Turbo 1995-98
Diagram ref no 3
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99311119500
The product you are viewing cross references to these numbers
Product Information
Exhaust seal ring for heat exchangers, SET OF 63 required per side
This exhaust seal ring is designed for Porsche 964 and 993 models, replicating the original gasket’s fit, function, and durability. It provides a gas-tight seal between the exhaust manifold or heat exchanger and the cylinder head, restoring quiet, leak-free, and efficient exhaust performance.
Fits:
Porsche 964 C2 / C4 / Carrera RS 1989-94
Porsche 993 Carrera / Turbo 1995-98
Diagram ref no 3
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99311119500
99311119500
71-24953-30
712495330
The product you are viewing cross references to these numbers
About kit
This kit is comprised of the following items:
6 x Exhaust seal ring for heat exchangers. Porsche 964 / 993 (99311119500/1
Vehicle Group
Vehicle Group
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 964 (911) RS 3.6L 1991-93
- Porsche 964 (911) RS 3.8L 1991-93
- Porsche 993 (911) C2 1994-97
- Porsche 993 (911) C4 1994-97
- Porsche 993 (911) RS 1994-97
- Porsche 993 (911) C2S 1994-97
- Porsche 993 (911) C4S 1994-97
- Porsche 993 (911) TURBO 1994-96
- Porsche 993 (911) TURBO S 1994-97
€62.64 inc. VAT
Now €56.40 inc. VAT
In Stock - 24 Hour Dispatch
1620001110
Product Information
With TÜV on exhaust but not on catalytic converter
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
1620001110
The product you are viewing cross references to these numbers
Product Information
Exhaust set for 964 with single tail pipe and catalytic converter. Stainless steel, With TÜV on exhaust but not on catalytic converter
Standard exhaust system with catalytic converter, OE type final muffler and single tip.
Variant: Standard
Fits:
Porsche 964 1989-94 (not Turbo)
NOTE: In the United Kingdom, sports catalytic converters and bypass pipes do not have type approval and are not legally permitted for use on vehicles manufactured after 1st March 2001. They are not MOT compliant and cannot be used on public roads. These components are intended solely for race and track use.
For vehicles manufactured before 1st March 2001, a non-type approved sports catalytic converter may be fitted, provided it offers comparable performance to the original and the vehicle continues to meet the applicable emissions standards for its age. The vehicle must still pass an MOT test.
If you are located outside the UK, please check your local laws and regulations to ensure compliance.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
1620001110
1620001110
92.262S
1623104470
1621400710
1621100606
1621101900
1621200100
1625000300
1625000900
1623400100
1620701100
1620607300
1620606200
1620301400
1623104480
1623104470
92.247SCLAMP
99311119500
96411119205
96411119800
90007428202
99908405202
99908500102
92.241S
92.270S
92.560S
PO-92260S
91.024S
91.023S
96411104205
96411321316
96411321315
96411104504
96411104502
96411104605
96421104004
96421103905
96421103932
99908500103
The product you are viewing cross references to these numbers
About kit
This kit is comprised of the following items:
1 x Exhaust heat exchangers LEFT for Porsche 964 C2 / C4 (96421103905/1
1 x Exhaust heat exchangers RIGHT for Porsche 964 C2 / C4 (96421104004/1
1 x Exhaust catalytic converter sports, 100 cell. Porsche 964 (1620301400
1 x Exhaust muffler / silencer rear box. With TÜV/EEC approval Porsche 964 C2 / C4 (1620606200
1 x Exhaust muffler / silencer rear box Sports. With TÜV/EEC approval Porsche 964 C2/C4 (96422092270S
1 x Exhaust tail pipes '964 Look' for Porsche 964 Dansk (1620701100
4 x Exhaust hexnut for heat exchanger. Porsche 911 1965-89 (99908500103/1
16 x Exhaust Lock Nut for Bolt. Porsche 964 (99908405202/1
8 x Exhaust bolt M8 x 40, Standard bold. Porsche 911 1974-89 (90007428202/1
1 x Exhaust gasket. Porsche 964 1990-94 (96411119800/1
1 x Heat exhanger to crossover pipe gasket. Porsche 964 C2 / C4 (96411119205/1
6 x Exhaust seal ring for heat exchangers. Porsche 964 / 993 (99311119500/1
3 x Exhaust O-Ring and clamp kit for Tail pipe. Porsche 964 (964111CKIT
Vehicle Group
Vehicle Group
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 964 (911) RS 3.6L 1991-93
- Porsche 964 (911) RS 3.8L 1991-93
€6,734.44 inc. VAT
Now €6,425.82 inc. VAT
Due In 30+ Days
EXHAUSTKIT62
Product Information
- Heat exchangers
- 100 Cell catalyst
- Centre muffler (standard)
- G-pipe final muffler bypass
- 102mm angle cut tail pipe
This system will be a bit louder than standard system as it comes with reduced catalyst and final muffler bypass (G-pipe).
Fits:
Porsche 964 1989-94 (not Turbo)
*excluding Carrera 2 Tiptronic cars M64.02 engines
Fitting kit not included in price and available separately.
NOTE: In the United Kingdom, sports catalytic converters and bypass pipes do not have type approval and are not legally permitted for use on vehicles manufactured after 1st March 2001. They are not MOT compliant and cannot be used on public roads. These components are intended solely for race and track use.
For vehicles manufactured before 1st March 2001, a non-type approved sports catalytic converter may be fitted, provided it offers comparable performance to the original and the vehicle continues to meet the applicable emissions standards for its age. The vehicle must still pass an MOT test.
If you are located outside the UK, please check your local laws and regulations to ensure compliance.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
EXHAUSTKIT62
The product you are viewing cross references to these numbers
Product Information
Full exhaust system made out of stainless steel including: - Heat exchangers
- 100 Cell catalyst
- Centre muffler (standard)
- G-pipe final muffler bypass
- 102mm angle cut tail pipe
This system will be a bit louder than standard system as it comes with reduced catalyst and final muffler bypass (G-pipe).
Fits:
Porsche 964 1989-94 (not Turbo)
*excluding Carrera 2 Tiptronic cars M64.02 engines
Fitting kit not included in price and available separately.
NOTE: In the United Kingdom, sports catalytic converters and bypass pipes do not have type approval and are not legally permitted for use on vehicles manufactured after 1st March 2001. They are not MOT compliant and cannot be used on public roads. These components are intended solely for race and track use.
For vehicles manufactured before 1st March 2001, a non-type approved sports catalytic converter may be fitted, provided it offers comparable performance to the original and the vehicle continues to meet the applicable emissions standards for its age. The vehicle must still pass an MOT test.
If you are located outside the UK, please check your local laws and regulations to ensure compliance.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
EXHAUSTKIT62
96422000021
3606406401
3606109641
96421103905
96421104004
3606009401
96411104205
96411321316
96411321315
96411104504
96411104502
96411104605
96421103932
The product you are viewing cross references to these numbers
About kit
This kit is comprised of the following items:
1 x Exhaust muffler / silencer race G-Pipe. Porsche 964 / 965 (96422000021
1 x DesignTek Exhaust tail pipes 102mm Outlet for Porsche 964 (3606406401
1 x Exhaust Catalytic Converter Pipes 100 Cell for Porsche 964 C2/ C4 DesignTek (3606109641
1 x Exhaust heat exchangers LEFT for Porsche 964 C2 / C4 (96421103905/1
1 x Exhaust heat exchangers RIGHT for Porsche 964 C2 / C4 (96421104004/1
1 x Exhaust Muffler / Silencer Rear box. Porsche 964 DesignTek (3606009401
Vehicle Group
Vehicle Group
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 964 (911) RS 3.6L 1991-93
- Porsche 964 (911) RS 3.8L 1991-93
€5,388.36 inc. VAT
Now €5,042.24 inc. VAT
Orderable - 14 to 21 Days
EXHAUSTKIT63
Product Information
- Heat exchangers
- 100 Cell catalyst
- Race pipe - centre muffler bypass
- G-pipe - final muffler bypass
- 102mm angle cut tail pipe
This system will be very loud. Loudest combination possible. Track car sound. Comes with reduced catalyst, centre muffler bypass (race pipe) and final muffler bypass (G-pipe).
Fits:
Porsche 964 1989-94 (not Turbo)
*excluding Carrera 2 Tiptronic cars M64.02 engines
Fitting kit not included in price and available separately.
NOTE: In the United Kingdom, sports catalytic converters and bypass pipes do not have type approval and are not legally permitted for use on vehicles manufactured after 1st March 2001. They are not MOT compliant and cannot be used on public roads. These components are intended solely for race and track use.
For vehicles manufactured before 1st March 2001, a non-type approved sports catalytic converter may be fitted, provided it offers comparable performance to the original and the vehicle continues to meet the applicable emissions standards for its age. The vehicle must still pass an MOT test.
If you are located outside the UK, please check your local laws and regulations to ensure compliance.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
EXHAUSTKIT63
The product you are viewing cross references to these numbers
Product Information
Full exhaust system made out of stainless steel including: - Heat exchangers
- 100 Cell catalyst
- Race pipe - centre muffler bypass
- G-pipe - final muffler bypass
- 102mm angle cut tail pipe
This system will be very loud. Loudest combination possible. Track car sound. Comes with reduced catalyst, centre muffler bypass (race pipe) and final muffler bypass (G-pipe).
Fits:
Porsche 964 1989-94 (not Turbo)
*excluding Carrera 2 Tiptronic cars M64.02 engines
Fitting kit not included in price and available separately.
NOTE: In the United Kingdom, sports catalytic converters and bypass pipes do not have type approval and are not legally permitted for use on vehicles manufactured after 1st March 2001. They are not MOT compliant and cannot be used on public roads. These components are intended solely for race and track use.
For vehicles manufactured before 1st March 2001, a non-type approved sports catalytic converter may be fitted, provided it offers comparable performance to the original and the vehicle continues to meet the applicable emissions standards for its age. The vehicle must still pass an MOT test.
If you are located outside the UK, please check your local laws and regulations to ensure compliance.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
EXHAUSTKIT63
96422000021
3606406401
3606109641
96421103905
96421104004
3606006403
96411104205
96411321316
96411321315
96411104504
96411104502
96411104605
96421103932
The product you are viewing cross references to these numbers
About kit
This kit is comprised of the following items:
1 x Exhaust muffler / silencer race G-Pipe. Porsche 964 / 965 (96422000021
1 x DesignTek Exhaust tail pipes 102mm Outlet for Porsche 964 (3606406401
1 x Exhaust Catalytic Converter Pipes 100 Cell for Porsche 964 C2/ C4 DesignTek (3606109641
1 x Exhaust heat exchangers LEFT for Porsche 964 C2 / C4 (96421103905/1
1 x Exhaust heat exchangers RIGHT for Porsche 964 C2 / C4 (96421104004/1
1 x Exhaust race pipe. Porsche 964 (3606006403
Vehicle Group
Vehicle Group
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 964 (911) RS 3.6L 1991-93
- Porsche 964 (911) RS 3.8L 1991-93
€5,020.61 inc. VAT
Now €4,711.26 inc. VAT
Orderable - 14 to 21 Days
EXHAUSTKIT64
Product Information
- Heat exchangers
- 100 Cell catalyst
- Race bypass pipe for primary muffler
- Final muffler (standard)
- 102mm angle cut tail pipe
This system will be a lot louder than standard system as it comes with reduced catalyst and race pipe instead of the primary muffler.
Fits:
Porsche 964 1989-94 (not Turbo)
*excluding Carrera 2 Tiptronic cars M64.02 engines
Fitting kit not included in price and available separately.
NOTE: In the United Kingdom, sports catalytic converters and bypass pipes do not have type approval and are not legally permitted for use on vehicles manufactured after 1st March 2001. They are not MOT compliant and cannot be used on public roads. These components are intended solely for race and track use.
For vehicles manufactured before 1st March 2001, a non-type approved sports catalytic converter may be fitted, provided it offers comparable performance to the original and the vehicle continues to meet the applicable emissions standards for its age. The vehicle must still pass an MOT test.
If you are located outside the UK, please check your local laws and regulations to ensure compliance.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
EXHAUSTKIT64
The product you are viewing cross references to these numbers
Product Information
Full exhaust system made out of stainless steel including: - Heat exchangers
- 100 Cell catalyst
- Race bypass pipe for primary muffler
- Final muffler (standard)
- 102mm angle cut tail pipe
This system will be a lot louder than standard system as it comes with reduced catalyst and race pipe instead of the primary muffler.
Fits:
Porsche 964 1989-94 (not Turbo)
*excluding Carrera 2 Tiptronic cars M64.02 engines
Fitting kit not included in price and available separately.
NOTE: In the United Kingdom, sports catalytic converters and bypass pipes do not have type approval and are not legally permitted for use on vehicles manufactured after 1st March 2001. They are not MOT compliant and cannot be used on public roads. These components are intended solely for race and track use.
For vehicles manufactured before 1st March 2001, a non-type approved sports catalytic converter may be fitted, provided it offers comparable performance to the original and the vehicle continues to meet the applicable emissions standards for its age. The vehicle must still pass an MOT test.
If you are located outside the UK, please check your local laws and regulations to ensure compliance.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
EXHAUSTKIT64
96411104205
96411321316
96411321315
96411104504
96411104502
96411104605
96421104004
96421103905
96421103932
The product you are viewing cross references to these numbers
About kit
This kit is comprised of the following items:
1 x Exhaust muffler / silencer rear box Sports. With TÜV/EEC approval Porsche 964 C2/C4 (96422092280S
1 x DesignTek Exhaust tail pipes 102mm Outlet for Porsche 964 (3606406401
1 x Exhaust Catalytic Converter Pipes 100 Cell for Porsche 964 C2/ C4 DesignTek (3606109641
1 x Exhaust heat exchangers LEFT for Porsche 964 C2 / C4 (96421103905/1
1 x Exhaust heat exchangers RIGHT for Porsche 964 C2 / C4 (96421104004/1
1 x Exhaust race pipe. Porsche 964 (3606006403
Vehicle Group
Vehicle Group
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 964 (911) RS 3.6L 1991-93
- Porsche 964 (911) RS 3.8L 1991-93
€5,742.74 inc. VAT
Now €5,361.18 inc. VAT
Orderable - 14 to 21 Days
MANIFOLDKIT964
Product Information
Fits:
Porsche 964
Product Information
Exhaust heat exchanger fitting kit. Includes studs and nuts made out of titanium.
These titanium components are resistant to rust and corrosion, which can be a common issue with traditional steel studs and nuts. This corrosion resistance ensures that the studs and nuts maintain their integrity, allowing for easy removal and installation when necessary. They are the perfect upgrade for Porsche enthusiasts who demand the ease of access to vehicle's exhaust system.Fits:
Porsche 964
About kit
This kit is comprised of the following items:
6 x Exhaust seal ring for heat exchangers. Porsche 964 / 993 (99311119500/1
1 x Exhaust head stud kit in Titanium. Porsche 964 (TITANSTUDS964
Vehicle Group
Vehicle Group
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
€242.44 inc. VAT
Now €218.22 inc. VAT
In Stock - 24 Hour Dispatch
9M96411104205
Product Information
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
9M96411104205
The product you are viewing cross references to these numbers
Product Information
Catalytic converter repair flange
Fits:
Porsche 964 (911) C2 1989-93
Porsche 964 (911) C4 1989-93
Porsche 964 (911) RS 3.6L 1991-93
Porsche 964 (911) RS 3.8L 1991-93
Ninemeister Converter Repair Flange
Over time, age, heat cycles, and corrosion take their toll on Porsche exhaust systems. A common weak point is the catalytic converter flange, which can corrode and eventually disintegrate. When this happens, it compromises the seal in your exhaust system, leading to exhaust leaks, loss of performance, and increased noise.
The Ninemeister repair flange is a high-quality replacement solution designed specifically to restore your Porsche’s exhaust integrity.
Key Features
- Direct
Repair Solution – allows you to remove the corroded flange and re-weld
this precision-machined replacement in place.
- Durable
Construction – built to withstand the extreme heat and corrosive
conditions of Porsche exhaust systems.
- Restores
Exhaust Sealing – eliminates leaks, restores back pressure, and
ensures smooth engine performance.
- Cost-Effective
Repair – no need to replace the entire catalytic converter when only
the flange is damaged.
- Tailored Fitment – engineered to match Porsche specifications for proper alignment and fit.
Why Replace a Corroded Converter Flange?
- Eliminate
Exhaust Leaks – prevent harmful gases from escaping and affecting
cabin safety.
- Restore
Performance – exhaust leaks reduce back pressure, causing poor
throttle response and reduced efficiency.
- Prevent
Further Damage – corrosion at the flange can spread, leading to costly
catalytic converter or exhaust system replacements.
- Long-Term Reliability – a fresh flange ensures your exhaust remains structurally sound for years to come.
The Ninemeister catalytic converter repair flange provides a reliable, cost-effective fix for corroded catalytic converter
flanges, helping you keep your Porsche exhaust system safe, efficient, and true
to factory performance.
Section of diagram ref no 1
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
9M96411104205
96411104205
96411321310
96411321306
96411321316
96411321317
96421103905
96421103932
The product you are viewing cross references to these numbers
Vehicle Group
Vehicle Group
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 964 (911) RS 3.6L 1991-93
- Porsche 964 (911) RS 3.8L 1991-93
Price: €40.60 inc. VAT
Orderable - 3 to 6 Days
Shop Securely
12 Month Warranty
Worldwide Delivery
TITANSTUDS12
Product Information
• Ultra-high-performance product
• Use of Titanium Ti6Al4V technology
Contains 12 x Studs, Nuts & Washers
Fits:
Porsche 911 1965-77
Porsche 964 (none Turbo)
Porsche 993 All
Porsche 996 (none Turbo)
Porsche 997 (none Turbo)
Porsche 986 All
Porsche 987 All
Porsche 718 4 Cyl Turbo
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
TITANSTUDS12
The product you are viewing cross references to these numbers
Product Information
These titanium components are resistant to rust and corrosion, which can be a common issue with traditional steel studs and nuts. This corrosion resistance ensures that the studs and nuts maintain their integrity, allowing for easy removal and installation when necessary. They are the perfect upgrade for Porsche enthusiasts who demand the ease of access to vehicle's exhaust system. • Ultra-high-performance product
• Use of Titanium Ti6Al4V technology
Contains 12 x Studs, Nuts & Washers
Fits:
Porsche 911 1965-77
Porsche 964 (none Turbo)
Porsche 993 All
Porsche 996 (none Turbo)
Porsche 997 (none Turbo)
Porsche 986 All
Porsche 987 All
Porsche 718 4 Cyl Turbo
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
TITANSTUDS12
99906200602
99908400201
99908400201
90006010601
99907507100
90037813100
9990750710A
99907507400
90037813100
90007428702
99907353501
99907358901
The product you are viewing cross references to these numbers
Vehicle Group
Vehicle Group
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche Boxster 986 2.7L 2003-04
- Porsche Boxster S 986 3.2L 2003-04
- Porsche Boxster 987 2.7L 2005 -08/08
- Porsche Boxster 987 S 3.2/3.4L 2005-08/08
- Porsche Boxster 987 MKII 2.9L 2009-2012
- Porsche Boxster S 987 MKII 3.4L 2009-2012
- Porsche Boxster 718 2.0L Manual (300 Bhp)
- Porsche Boxster 718 2.0L PDK (300 Bhp)
- Porsche Boxster S 718 2.5L Manual (350 Bhp)
- Porsche Boxster S 718 2.5L PDK (350 Bhp)
- Porsche Boxster T 718 2.0L Manual (300 Bhp)
- Porsche Boxster T 718 2.0L PDK (300 Bhp)
- Porsche Boxster GTS 718 2.5L Manual (365 Bhp)
- Porsche Boxster GTS 718 2.5L PDK (365 Bhp)
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 964 (911) RS 3.6L 1991-93
- Porsche 964 (911) RS 3.8L 1991-93
- Porsche 993 (911) C2 1994-97
- Porsche 993 (911) C4 1994-97
- Porsche 993 (911) RS 1994-97
- Porsche 993 (911) C2S 1994-97
- Porsche 993 (911) C4S 1994-97
- Porsche 993 (911) TURBO 1994-96
- Porsche 993 (911) GT2 1994-97
- Porsche 993 (911) TURBO S 1994-97
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
- Porsche 997 MK1 Carrera 2 3.6L 2005-08
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 Carrera 4 3.6L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
- Porsche Cayman 718 2.0L Manual (300Bhp)
- Porsche Cayman 718 2.0L PDK (300Bhp)
- Porsche Cayman S 718 2.5L Manual (350Bhp)
- Porsche Cayman S 718 2.5L PDK (350Bhp)
- Porsche Cayman T 718 2.0L Manual (300Bhp)
- Porsche Cayman T 718 2.0L PDK (300 Bhp)
- Porsche Cayman GTS 718 2.5L Manual (365 Bhp)
- Porsche Cayman GTS 718 2.5L PDK (365 Bhp)
€179.80 inc. VAT
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96421103905
Product Information
Fits:
Porsche 964 C2 / C4 1990-94
Not for models with tiptronic.
Click 'Zoom in' for large parts diagram.
Diagram ref no
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96421103905
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Product Information
Exhaust Heat Exchanger. LEFT. Fits:
Porsche 964 C2 / C4 1990-94
Not for models with tiptronic.
Click 'Zoom in' for large parts diagram.
Diagram ref no
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96421103905
96421103905
96421104004
96421103932
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Vehicle Group
Vehicle Group
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
Price: €4,454.02 inc. VAT
Orderable - 14 to 28 Days
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96421104005
Product Information
Fits:
Porsche 964 C2 / C4 1990-94
Click 'Zoom in' for large parts diagram.
Diagram ref no 2
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96421104005
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Product Information
Exhaust Heat Exchanger. RIGHT. Fits:
Porsche 964 C2 / C4 1990-94
Click 'Zoom in' for large parts diagram.
Diagram ref no 2
Related reference numbers
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96421104005
96421103905
96421104004
96421103932
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Vehicle Group
Vehicle Group
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
Price: €2,976.77 inc. VAT
Orderable
Shop Securely
12 Month Warranty
Worldwide Delivery
96421103905/1
Product Information
Polished stainless steel.
Fits:
Porsche 964 C2 / C4 1990-94
Not for models with tiptronic.
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96421103905
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Product Information
Exhaust heat exchangers LEFTPolished stainless steel.
Fits:
Porsche 964 C2 / C4 1990-94
Not for models with tiptronic.
Related reference numbers
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96421103905
91.023S
91.024S
1623104470
1623104480
96421103905
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Vehicle Group
Vehicle Group
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
€1,993.70 inc. VAT
Now €1,794.33 inc. VAT
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96421104004/1
Product Information
Stainless steel.
Fits:
Porsche 964 C2 / C4 1990-94
Not for models with Tiptronic.
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96421104004
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Product Information
Exhaust heat exchangers RIGHT.Stainless steel.
Fits:
Porsche 964 C2 / C4 1990-94
Not for models with Tiptronic.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
96421104004
91.023S
91.024S
1623104470
1623104480
96421103905
96421104004
The product you are viewing cross references to these numbers
Vehicle Group
Vehicle Group
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
Price: €1,927.21 inc. VAT
Orderable - 14 to 21 Days
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3606006401
Product Information
DesignTek Maximum power and aggressive sports car sound exactly like the factory 3.8L Supercup 964's. primarily intended for the track or race. This system has some resonance and is very sporty and aggressive. Please note this system bypass the cats and the heating system of the car.
This kit includes:
Headers
Rear Box
This kit does not include the CATS. Header to engine gaskets are not included. You can add them to the basket when you buy this exhaust.
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3606006401
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Exhaust Muffler / Silencer Rear box Race System DesignTek Maximum power and aggressive sports car sound exactly like the factory 3.8L Supercup 964's. primarily intended for the track or race. This system has some resonance and is very sporty and aggressive. Please note this system bypass the cats and the heating system of the car.
This kit includes:
Headers
Rear Box
This kit does not include the CATS. Header to engine gaskets are not included. You can add them to the basket when you buy this exhaust.
Manifold to Head internal diameter is 39MM
Manifold to Rear silencer internal diameter is 56MM
Fits:
Porsche 964 1990-94
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3606006401
3606006401
116081
69-PS101
96411104504
96411104605
96411104205
96411321316
96411321315
96411104502
96421104004
96421103905
96421103932
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Vehicle Group
Vehicle Group
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 964 (911) RS 3.6L 1991-93
- Porsche 964 (911) RS 3.8L 1991-93
€810.84 inc. VAT
Now €729.76 inc. VAT
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99311119500
Product Information
3 per side. Price is for each.
Fits:
Porsche 964 C2 / C4 / Carrera RS 1989-94
Porsche 993 Carrera / Turbo 1995-98
Click 'Zoom in' for large parts diagram.
Diagram ref no 3
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99311119500
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Product Information
Exhaust seal ring for heat exchangers.3 per side. Price is for each.
Fits:
Porsche 964 C2 / C4 / Carrera RS 1989-94
Porsche 993 Carrera / Turbo 1995-98
Click 'Zoom in' for large parts diagram.
Diagram ref no 3
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99311119500
99311119500
71-24953-30
712495330
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Vehicle Group
Vehicle Group
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 964 (911) RS 3.6L 1991-93
- Porsche 964 (911) RS 3.8L 1991-93
- Porsche 993 (911) C2 1994-97
- Porsche 993 (911) C4 1994-97
- Porsche 993 (911) RS 1994-97
- Porsche 993 (911) C2S 1994-97
- Porsche 993 (911) C4S 1994-97
- Porsche 993 (911) TURBO 1994-96
- Porsche 993 (911) TURBO S 1994-97
Price: €16.37 inc. VAT
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99311119500/1
Product Information
3 per side. Price is for each.
Exhaust seal ring is designed to replicate the original gasket’s fit and durability, it ensures a gas-tight seal between the exhaust manifold or heat exchanger and the cylinder head—restoring quiet, efficient performance.
Fits:
Porsche 964 C2 / C4 / Carrera RS 1989-94
Porsche 993 Carrera / Turbo 1995-98
Diagram ref no 3
• Seals the connection between the exhaust header / heat exchanger and the engine, preventing exhaust gas leaks
• Helps maintain correct back-pressure, avoids losing efficiency, and ensures proper exhaust flow
Over time, the original seal ring can become brittle, corroded, or compressed, causing exhaust leaks, noise, and potential loss of performance. Installing an OE-Match ring restores a tight, gas-proof seal, helping preserve exhaust integrity and efficiency.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99311119500
The product you are viewing cross references to these numbers
Product Information
Exhaust seal ring for heat exchangers.3 per side. Price is for each.
Exhaust seal ring is designed to replicate the original gasket’s fit and durability, it ensures a gas-tight seal between the exhaust manifold or heat exchanger and the cylinder head—restoring quiet, efficient performance.
Fits:
Porsche 964 C2 / C4 / Carrera RS 1989-94
Porsche 993 Carrera / Turbo 1995-98
Diagram ref no 3
• Seals the connection between the exhaust header / heat exchanger and the engine, preventing exhaust gas leaks
• Helps maintain correct back-pressure, avoids losing efficiency, and ensures proper exhaust flow
Over time, the original seal ring can become brittle, corroded, or compressed, causing exhaust leaks, noise, and potential loss of performance. Installing an OE-Match ring restores a tight, gas-proof seal, helping preserve exhaust integrity and efficiency.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99311119500
99311119500
71-24953-30
712495330
The product you are viewing cross references to these numbers
Vehicle Group
Vehicle Group
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 964 (911) RS 3.6L 1991-93
- Porsche 964 (911) RS 3.8L 1991-93
- Porsche 993 (911) C2 1994-97
- Porsche 993 (911) C4 1994-97
- Porsche 993 (911) RS 1994-97
- Porsche 993 (911) C2S 1994-97
- Porsche 993 (911) C4S 1994-97
- Porsche 993 (911) TURBO 1994-96
- Porsche 993 (911) TURBO S 1994-97
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Now €9.40 inc. VAT
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About Heat Exchangers
Exhaust Heat Exchangers for Porsche | Engine Efficiency & Cabin Comfort
Exhaust heat exchangers play a crucial role in your Porsche’s exhaust and heating systems. They recover heat from the exhaust gases and use it to warm the cabin or assist in managing engine temperature. Built for both performance and comfort, these components ensure efficient energy transfer without compromising exhaust flow or emissions.
At Design911, we stock a wide selection of high-quality exhaust heat exchangers designed for classic and modern Porsche models. Each unit is precision-engineered for optimal heat transfer, corrosion resistance, and long-term durability. Whether you’re restoring a classic air-cooled 911 or servicing a newer model, our heat exchangers maintain proper exhaust gas routing and cabin warmth with efficiency and reliability.
What Do Exhaust Heat Exchangers Do?
An exhaust heat exchanger captures waste heat from exhaust gases and uses it to warm air before it’s directed into the cabin or engine system. This helps improve comfort and overall energy efficiency, particularly in air-cooled Porsche engines.
Core Functions:
- Transfers
exhaust heat for cabin heating or auxiliary systems.
- Maintains
consistent engine temperature by controlling heat flow.
- Improves
thermal efficiency and reduces warm-up time.
- Supports
emissions control by stabilising combustion conditions.
- Preserves performance by ensuring balanced exhaust back pressure.
A properly functioning heat exchanger enhances both driving comfort and exhaust efficiency — essential for performance and reliability.
Why Do Exhaust Heat Exchangers Fail?
Due to continuous exposure to heat, moisture, and exhaust gases, exhaust heat exchangers naturally deteriorate over time.
Common Causes of Failure Include:
- Corrosion
and rust from condensation or road salt.
- Cracks
or leaks caused by metal fatigue or impact damage.
- Carbon
buildup restricting airflow and heat transfer.
- Warping
from repeated heating and cooling cycles.
- Exhaust gas leakage leading to fumes entering the cabin.
A failed heat exchanger can cause loss of cabin heating, reduced efficiency, or even exhaust gas contamination inside the vehicle, making timely replacement vital for safety and comfort.
Why Replace or Upgrade Your Exhaust Heat Exchanger?
Replacing a damaged or leaking exhaust heat exchanger ensures optimal heat transfer, clean air circulation, and continued engine efficiency.
Key Benefits:
Restores
heating performance for air-cooled Porsche systems.
Prevents
exhaust leaks and cabin gas contamination.
Improves
exhaust gas flow and efficiency.
Crafted
from high-grade stainless steel for corrosion resistance.
Precision
fitment for Porsche 911, 914, and other classic models.
Essential
for safe, efficient operation of vintage air-cooled engines.
Modern replacements offer improved materials and engineering, ensuring greater reliability and longer service life than older designs.
Highlights:
- High-quality replacement exhaust heat exchangers for Porsche.
- Restores cabin heating and improves exhaust efficiency.
- Constructed from stainless or aluminised steel for longevity.
- Prevents harmful exhaust leaks into the vehicle cabin.
- Perfect fit for air-cooled and modern Porsche applications.
- Ideal for restorations, rebuilds, and performance maintenance.
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