Catalyst / Bypass

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Related, superseded, cross reference or alternative numbers for comparison.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

The product you are viewing cross references to these numbers

Exhaust Catalytic Converter Bypass Pipes



DesignTek stainless steel catalyst by-pass produces more air flow which in turn produces more power. Designed to give a deeper more sporter sound.

This product comes with the hole to re-fit the lambda sensor.

Fits:
Porsche 964 C2 / C4 1989-94

Please note: These sport cats will make your car sound louder than with stock cats. If you have ,or intend to install sport silencers, you may find the car is a bit loo loud. We recommend to use one sport exhaust component if you are concerned about decibel levels.

Design 911 Recommends this product best value and best quality

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.

3606209641

The product you are viewing cross references to these numbers

Exhaust Catalytic Converter Pipes 100 Cell



DesignTek stainless steel sports 100 cell catalyst, with German hi-flow catalyst. Produces more air flow which in turn produces more power. Designed to give a deeper more sporter sound.

This product comes with the hole to re-fit the lambda sensor.

Fits:
Porsche 964 C2 / C4 1989-94

Please note: These sport cats will make your car sound louder than with stock cats. If you have ,or intend to install sport silencers, you may find the car is a bit loo loud. We recommend to use one sport exhaust component if you are concerned about decibel levels.

Design 911 Recommends this product best value and best quality

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.

3606109641

The product you are viewing cross references to these numbers

Sports Catalytic Converter with catalytic ceramic insert, 100 cell. With Lambda sensor hole and plug. Polished stainless steel.



Fits:
Porsche 964 C2 / C4 1990-94

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.

1620301400

The product you are viewing cross references to these numbers

Sports Catalytic Converter without catalytic ceramic insert. With Lambda sensor hole and plug. Polished stainless steel. This is a Cat bypass product.

Fits:
Porsche 964 C2 / C4 1990-94

Please note: These sport cats will make your car sound louder than with stock cats. If you have ,or intend to install sport silencers, you may find the car is a bit loo loud. We recommend to use one sport exhaust component if you are concerned about decibel levels.

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.

96421100391

The product you are viewing cross references to these numbers

Lambda Sensor Blanking Plug and Receiver Socket Set.
In case you need to relocate your existing lambda probe because it's not in the right location. Welding and cutting specialist required.


Fits:
Many Porsche vehicles. Universal kit.

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

100390100392

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