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Design 911 Design 911 supply Porsche parts, Porsche spares and Porsche accessories, to both retail and to the trade. Our Porsche product and accessory range includes brakes, exhausts, tyres, wheels and Porsche panels and interiors. https://design91.uk/images/schemaLogo.png https://design91.uk/images/schemaLogo.png +443456003478 https://design91.uk Facebook Instagram

Exhaust Nuts / Bolts / Studs

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DISPLAYING 1 to 16 (of 24 products)
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FITTINGKIT06
Product Information
Product Information
COMPLETE Exhaust Fitting Kit.*
Contains all necessary gaskets, clamps, sleeves, nuts, bolts and washers. Ideal when you change the whole exhaust system on your Porsche 996 - manifolds, catalytic converters and silencers at the same time.

*Brackets and holders not included but available separately

Fits:
Porsche 996 Carrera 3.4L
Porsche 996 Carrera 3.6L

*Click on the image to see a large parts diagram.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

FITTINGKIT06
9990750710A
99611110755
99611111350
99908405202
90007428702
99951108700
90037803301
90037802209
90003110501
90037818809
90037818709

The product you are viewing cross references to these numbers
FITTINGKIT28
Product Information
Product Information
Rear Silencer Exhaust Fitting Kit.*
Contains all necessary clamps, sleeves, nuts, bolts and washers. Ideal when you change the rear exhaust silencers on your Porsche 996

*Brackets and holders not included but available separately

Fits:
Porsche 996 Carrera 3.4L
Porsche 996 Carrera 3.6L

*Click on the image to see a large parts diagram.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

FITTINGKIT28
99611110800
99611122002

The product you are viewing cross references to these numbers
FITTINGKIT09
Product Information
Product Information
Manifold fitting kit.

Contains all necessary gaskets, nuts & bolts.

Fits:
Porsche 996 Carrera 3.6L
FITTINGKIT35
Product Information
Product Information
Mounting kit for catalytic converter pipes with clamps, gaskets, nuts & bolts.

oematch

Fits:
Porsche 996 Carrera 3.4L-3.6L 1998-05
Porsche 996 GT3 3.6 2004-05
Porsche 996 GT3 3.6 1999-01

Also Fits Catalytic Converter Bypass / Sports kits
99611196260S, 996PO96260S and 996PO96270S.

Click 'Zoom in' for large parts diagram.
Diagram ref no 7, 8, 13, 29 and 37



Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

FITTINGKIT35
99611122001
99611122002
99711152000
99951108700
99611111350
99908405202
90007428702

The product you are viewing cross references to these numbers
96300KIT
Product Information
Product Information
Mounting Kit for Rear Exhaust.

oematch

Fits:
Porsche 996 Carrera 3.4L-3.6L 1998-05
Porsche 996 GT3 3.6 2004-05
Porsche 996 GT3 3.4 1999-01

Kit included:
2x 99611122002 Pipe Connector, 55.5x75mm
2x 99611110800 Clamp, Ø70mm
2x 90037818301 Bolt, M8x1.25x140mm
2x 90037810501 Bolt, M8x1.25x70mm
12x 90038000501 Lock nut, M8x1.25mm

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

96300KIT
90037818301
90037810501
90038000501
99611122002
99611110800

The product you are viewing cross references to these numbers
SR067
Product Information
Product Information
Exhaust bolt repair kit for Boxster / 996 / 997 Carrera & Cayman Gen1 1997- 2009 (Not GT3, GT2 or TT engines)

stomski

With more and more broken exhaust bolts reported on the water-cooled engines, the headache of repairing a broken bolt is becoming epidemic. Tasks ranging from a simple exhaust system update through an engine removal, are consistently plagued by snapped, rusted, and broken exhaust manifold bolts. Rarely can an accurate removal of the broken bolt be performed with the engine in the car, and even after removal, the task is time consuming and if not done carefully can lead to a damaged head or faulty repair. STOMSKI RACING's answer to these problems is the SR067, a kit that easily, accurately, and flexibly allows you to drill out the broken bolts - with the engine still in the car- saving time and headaches. A CNC milled plate indexes precisely off the broken bolts and/or bolt holes. Using our uniquely designed Thumb Screws, the SR067 plate is locked in place (by threading a Thumb Screw over a broken bolt or by using a supplied bolt threaded through the SR067 Thumb Screw). With the included pilot drills and drill guides, the faulty bolt can be drilled out, producing a perfectly perpendicular and centered hole that if necessary can be chased with an included M8x1.25 tap.

Kit includes : anodized aluminum fixture, drill bits, tap with extension, drill jigs/guides, Thumb Screws, and hardware in a sturdy storage case.

Now also includes our SR065D drill guide.
TITANSTUDS12
Product Information
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. 

rohler

• 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
Special Order item
90037818301
Product Information
Product Information
Exhaust hexagon head bolt (LONG). M 8 x 140.
EACH

porsche

Fits:
Porsche 996 C2 / C4 / C4S 1998-05
Porsche 996 GT3 2000-05
Porsche 997 C2 / C4 / C2S / C4S 2005-08

Diagram ref no 24.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

90037818301
90037818301

The product you are viewing cross references to these numbers
90037818301/1
Product Information
Product Information
Exhaust hexagon head bolt (LONG). M 8 x 140.
EACH

oematch

Fits:
Porsche 996 C2 / C4 / C4S 1998-05
Porsche 996 GT3 2000-05
Porsche 997 C2 / C4 / C2S / C4S 2005-08

Diagram ref no 24.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

90037818301
90037818301
00538140

The product you are viewing cross references to these numbers
90037810501
Product Information
Product Information
Exhaust Hexagon Head Bolt (SHORT). M 8 x 70
EACH

oematch

Fits:
Porsche 996 C2 / C4 / C4S 1998-05
Porsche 996 GT3 2000-05
Porsche 997 C2 / C4 / C2S / C4S 2005-08

Diagram ref no 25.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

90037810501
90037810501

The product you are viewing cross references to these numbers
Special Order item
90038000501
Product Information
Product Information
Exhaust hexagon nut.
Sold EACH

porsche

Fits:
Porsche 996 C2 / C4 / C4S 1998-05
Porsche 996 GT3 2000-05
Porsche 997 C2 / C4 / C2S / C4S 2005-08

Click 'Zoom in' for large parts diagram.
Diagram ref no 16

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

90038000501
90038000501

The product you are viewing cross references to these numbers
90038000501/1
Product Information
Product Information
Exhaust hexagon nut. M8 zinc plated. Self locking.
Sold EACH.

oematch

Fits:
Porsche 996 C2 / C4 / C4S 1998-05
Porsche 996 GT3 2000-05
Porsche 997 C2 / C4 / C2S / C4S 2005-08

Click 'Zoom in' for large parts diagram.
Diagram ref no 16

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

90038000501
90038000501
90038000509

The product you are viewing cross references to these numbers
TITANTORXLONG12
Product Information
Product Information
Titanium exhaust manifold bolt M8x27. 
Set of 12  (OE Ref: 99907358901) 

rohler

Titanium is a highly corrosion-resistant material, which is particularly important in exhaust systems due to the exposure to extreme heat and moisture. The corrosion resistance of titanium bolts ensures longevity and reduces the risk of premature failure, ultimately saving the owner from costly repairs.

Fits:
Porsche 986 Boxster 1997-2004
Porsche 987 Boxster 2005-2008
Porsche 987C Cayman 2006-2008
Porsche 996 Carrera 1998-2004
Porsche 997.1 Carrera 2005-2008
Porsche 718 (982) Boxster 2017-2021
Porsche 718 (982C) Cayman 2017-2021


Click 'Zoom in' for large parts diagram.
Diagram ref no 3



Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

TITANTORXLONG12
99907358901
99907507400
90037813100
99907507100
9990750710A

The product you are viewing cross references to these numbers
Special Order item
9990750710A
Product Information
Product Information
Exhaust manifold bolt. M8 x 28.
12 Per car. Sold each

porsche

Fits:
Porsche 996 C2 / C4 / C4S
M96.03, 3.6L

Click 'Zoom in' for large parts diagram.
Diagram ref no 4.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

9990750710A
9990750710A
99907507100

The product you are viewing cross references to these numbers
Special Order item
90007428702
Product Information
Product Information
Exhaust manifold to catalytic converter bolt
M8 x 35. EACH

porsche

Fits:
Porsche 986 Boxster 1997-05
Porsche 996 C2 / C4 / C4S 1997-05
Porsche 996 GT3 1999-05
90007428702/1
Product Information
Product Information
Exhaust manifold to catalytic converter bolt. Stainless steel
M8 x 40. EACH

oematch

Fits:
Porsche 986 Boxster 1997-05
Porsche 996 C2 / C4 / C4S 1997-05
Porsche 996 GT3 1999-05

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

90007428702
90007428702

The product you are viewing cross references to these numbers
DISPLAYING 1 to 16 (of 24 products)
1 2
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About Exhaust Nuts / Bolts / Studs

Exhaust Nuts, Bolts & Studs for Porsche | Secure Fitment for High-Performance Exhaust Systems

Your Porsche’s exhaust system operates under extreme heat, vibration, and pressure — making durable fasteners like exhaust nuts, bolts, and studs essential for reliability and safety. These components secure exhaust manifolds, catalytic converters, mufflers, and pipes together, maintaining a tight seal and precise alignment throughout the system.

At Design911, we offer a wide selection of standard and precision-engineered exhaust fasteners designed to meet or exceed manufacturer specifications. Made from heat-resistant, corrosion-proof materials, these nuts, bolts, and studs ensure long-lasting performance, perfect fitment, and effortless installation for both standard and performance exhaust systems.

Whether you’re rebuilding a classic 911 or servicing a modern Porsche GT model, our high-strength exhaust fixing hardware provides superior durability and resistance to loosening under thermal cycling.

What Do Exhaust Nuts, Bolts & Studs Do?

These components are the backbone of the exhaust system’s structural integrity. They keep all exhaust sections securely connected, ensuring no movement or leaks under load.

Core Functions:

  • Secure exhaust joints and flanges between manifolds, catalytic converters, and pipes.
  • Maintain consistent exhaust pressure by preventing gaps or misalignment.
  • Reduce vibration and mechanical stress.
  • Enable easy serviceability for exhaust maintenance or upgrades.
  • Ensure safe operation under high heat and pressure.

Without robust fasteners, even the most advanced exhaust systems can suffer from leaks, rattling, or part failure — leading to reduced performance and increased emissions.

Why Do Exhaust Fasteners Fail?

Exhaust nuts, bolts, and studs operate in one of the harshest environments in a vehicle. Over time, exposure to heat, moisture, and vibration can degrade even the strongest materials.

Common Causes of Failure Include:

  • Corrosion or rust from moisture and road salt.
  • Thermal expansion causing loosening or cracking.
  • Over-torquing during installation.
  • Metal fatigue from repeated heating and cooling cycles.
  • Cross-threading or thread stripping during servicing.

When fasteners fail, exhaust leaks, rattling, and poor gas flow can occur — impacting performance, sound, and emissions compliance.

Why Replace or Upgrade Your Exhaust Fasteners?

Replacing worn or rusted exhaust hardware is vital for ensuring the longevity and reliability of your Porsche’s exhaust system.

Key Benefits:

  • Restores exhaust system integrity and secure fitment.
  • Prevents leaks, rattles, and misalignment. Improves exhaust flow and performance reliability.
  • Crafted from high-strength stainless steel or coated alloy.
  • Direct-fit compatibility for Porsche 911, Cayman, Boxster, Panamera & Macan.
  • Ideal for both restoration and performance applications.

High-quality fasteners not only provide peace of mind during installation but also withstand years of performance driving without corrosion or seizing.

Highlights:

  • Premium exhaust nuts, bolts & studs for Porsche vehicles.
  • Designed for high-heat, high-vibration environments.
  • Prevents leaks and loosening in the exhaust system.
  • Heat- and corrosion-resistant stainless steel construction.
  • Ideal for rebuilds, upgrades, or performance tuning.
  • Precision-engineered to manufacturer standards.

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