Fabspeed Exhaust

Fabspeed RSR Muffler Bypass Pipes.

The Fabspeed RSR Muffler Bypass Pipes are a motorsport-inspired exhaust upgrade for Porsche 911 964 Carrera models already equipped with the Fabspeed Maxflo RSR Header/Muffler Kit in its Non-Sport-Cat configuration.

Fits:

• Porsche 964 (911) C2 1989-94
• Porsche 964 (911) C4 1989-94

Designed to replace the Fabspeed mufflers with direct stainless-steel outlet pipes, they create a considerably less silenced exhaust path and give the air-cooled flat-six a much louder, more aggressive race-car character.

Rather than routing exhaust gases through conventional mufflers, the bypass pipes connect directly to the existing Fabspeed RSR headers. This reduces rear exhaust restriction and removes much of the sound attenuation provided by the mufflers.

The result is a raw, highly audible air-cooled exhaust note inspired by Porsche competition cars and intended primarily for drivers seeking maximum sound and a more direct motorsport experience.

Manufactured in-house by Fabspeed from T304L stainless steel, the pipes are designed for durability, heat resistance and straightforward bolt-on installation.

What This Product Does:
The RSR Muffler Bypass Pipes replace the muffler sections of the compatible Fabspeed exhaust with direct outlet pipes.

They are designed to:

• Eliminate the Fabspeed rear mufflers.
• Reduce rear exhaust restriction.
• Create a more direct exhaust path.
• Increase exhaust volume substantially.
• Produce a raw air-cooled flat-six sound.
• Give the vehicle an RSR / Cup-car-inspired exhaust character.
• Reduce the amount of sound attenuation in the exhaust system.
• Provide a lightweight and mechanically simple exhaust arrangement.
• Allow straightforward conversion back to the Fabspeed mufflers.
• Provide a bolt-on modification requiring no cutting or welding.

Symptoms Of Wear Or Failure:~
Possible symptoms include:

• Exhaust leaks.
• Ticking or blowing noises.
• Visible cracks.
• Cracked welds.
• Soot around joints.
• Loose V-band clamps.
• Excessive pipe movement.
• Exhaust vibration.
• Metallic rattling.
• Misaligned exhaust outlets.
• Pipework contacting bodywork.
• Dented or crushed tubing.
• Corrosion around mounting hardware.
• Exhaust smell around the rear of the vehicle.
• Increasing exhaust noise from an unintended leak rather than the outlet.

Because the pipes are intentionally loud, small leaks may be harder to identify by sound alone and should also be checked visually.

Why Replacement Matters:
Replacing damaged bypass pipes helps restore:

• Correct exhaust sealing.
• Proper system alignment.
• Unrestricted exhaust flow.
• Reliable V-band connections.
• Correct clearance from surrounding components.
• Structural integrity.
• Consistent exhaust sound.

On a vehicle used for performance driving or track events, maintaining exhaust integrity is particularly important because sustained high engine speeds create considerable exhaust heat.

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.

FSPOR964RSRMB

The product you are viewing cross references to these numbers

Fabspeed Secondary Muffler Bypass Pipe. 

The Fabspeed Porsche 964 Carrera Secondary Muffler Bypass Pipe is a performance exhaust upgrade designed to improve exhaust flow, reduce rear-end weight and deliver a more aggressive air-cooled flat-six exhaust note on Porsche 911 Carrera (964) models manufactured between 1989 and 1994.

Fits:

• Porsche 964 (911) C2 1989-94
• Porsche 964 (911) C4 1989-94
• Porsche 964 (911) RS 3.6L 1991-94
• Porsche 964 (911) RS 3.8L 1991-94

Developed as a replacement for the original right-hand secondary muffler, this straight-through exhaust pipe eliminates the bulky factory silencer and provides a more direct route for exhaust gases to exit the vehicle.

The Porsche 964 Carrera is powered by an air-cooled flat-six engine renowned for its distinctive mechanical character and engaging driving experience. However, its original exhaust system was designed to balance engine performance with noise reduction and everyday refinement.

The factory secondary muffler plays an important role in reducing exhaust sound before the gases exit through the rear tailpipe. While effective at controlling noise, its internal silencing arrangement also adds weight and may contribute to exhaust flow restriction.

Fabspeed developed this bypass pipe as a lightweight alternative inspired by the exhaust arrangements used on Porsche Motorsport's 964 Carrera Cup racing cars.

Manufactured from high-quality T304L stainless steel, the pipe features a full 3-inch (76 mm) diameter, CNC mandrel-bent construction and precisely TIG-welded joints.

The straight-through configuration reduces the restriction associated with the factory secondary muffler, allowing the engine's exhaust note to become more prominent.

Replacing the heavy original right-hand muffler also removes weight from the rear corner of the vehicle, potentially benefiting weight distribution and reducing the mass carried behind the rear axle.

Fabspeed advertises a weight saving of approximately 25 lbs (11.4 kg), although its product specifications also contain a different weight figure. The precise saving should therefore be confirmed for the vehicle and component configuration.

The bypass pipe is designed to work with compatible Porsche 964-style original equipment rear exhaust arrangements and retains the existing catalytic converter where fitted.

What This Product Does:
The Fabspeed Secondary Muffler Bypass Pipe replaces the original right-hand rear silencer with a straight-through stainless steel exhaust section.

Its primary functions include:

• Bypasses the Factory Secondary Muffler: Eliminates the original right-hand rear silencer from the exhaust path.
• Improves Exhaust Flow: Provides a less restrictive route for exhaust gases through the rear exhaust section.
• Enhances Exhaust Sound: Produces a louder, sportier air-cooled flat-six exhaust note.
• Reduces Rear-End Weight: Removes the mass of the factory secondary muffler from the right-hand rear corner.
• Supports Engine Response: Reduced exhaust restriction may improve throttle response under suitable operating conditions.
• Maintains the Original Catalytic Converter: Replaces a downstream muffler rather than the factory emissions-control catalyst.
• Preserves Compatible Factory Connections: Uses the corresponding original Porsche mounting and sealing arrangement.
• Accommodates Original Exhaust Tips: Allows the factory right-hand tailpipe outlet to be retained.
• Supports Motorsport-Inspired Builds: Recreates the general concept of a Porsche Carrera Cup-style rear muffler bypass.
• Provides Durable Stainless Steel Construction: T304L stainless steel helps resist corrosion and prolonged exhaust heat exposure.
• Maintains Smooth Pipe Geometry: CNC mandrel bending helps preserve internal pipe diameter through bends.
• Allows Reversible Modification: The factory secondary muffler can be refitted if the original components and mounting hardware remain available.

Symptoms Of Wear Or Failure:
The Fabspeed Secondary Muffler Bypass Pipe is primarily a performance upgrade rather than a component that requires replacement at a fixed service interval.

However, a damaged or deteriorating factory secondary muffler may need repair or replacement.

Typical symptoms:

• Ticking, hissing or blowing noises.
• Unusual increases in exhaust volume.
• Black soot deposits around pipe connections.
• Exhaust odours around the rear of the vehicle.
• Noise that becomes more noticeable under acceleration.
• Heavy corrosion on the muffler housing.
• Rust around welded seams.
• Perforations or holes.
• Flaking or weakened metal.
• Damaged exhaust connection surfaces.

Why Replacement / Upgrading Matters:
The Fabspeed Secondary Muffler Bypass Pipe offers a practical performance upgrade for Porsche 964 Carrera owners seeking reduced exhaust weight, less restrictive gas flow and a stronger flat-six soundtrack.

• Reduced Rear Weight: Replaces the heavy factory secondary muffler with lighter stainless steel pipework.
• More Aggressive Exhaust Sound: Enhances the character of the air-cooled Porsche engine.
• Improved Exhaust Flow: Removes the internal restrictions of the right-hand secondary silencer.
• Potentially Better Throttle Response: Reduced exhaust restriction may support quicker engine response.
• Motorsport-Inspired Design: Based on the secondary muffler bypass concept used on Porsche 964 Carrera Cup cars.
• 3-Inch Exhaust Diameter: Provides a direct-flow exhaust passage.
• T304L Stainless Steel: Offers corrosion resistance and high-temperature durability.
• CNC Mandrel-Bent Construction: Maintains consistent internal pipe dimensions.
• TIG-Welded Connections: Provides durable welded joints.
• Compatible with Factory Hardware: Reuses original Porsche clamps and sealing rings.
• Factory Tailpipe Compatibility: Allows the original right-hand exhaust tip to be retained.
• Optional Fabspeed Outlet Tip: Can be paired with a compatible 4.5-inch oval tip.
• Retains Catalytic Converter: Does not remove the factory catalyst when installed on the specified exhaust system.
• Reversible Installation: Allows refitting of the original secondary muffler.
• Fabspeed Lifetime Warranty: Covered by the manufacturer's stated warranty conditions.

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

FSPOR964SMB

The product you are viewing cross references to these numbers

Fabspeed Secondary Muffler Bypass Pipe.
The Fabspeed Porsche 964 Turbo / 965 / C2 Turbo Secondary Muffler Bypass Pipe is a performance exhaust upgrade designed to replace the factory secondary rear muffler with a freer-flowing stainless-steel pipe.

Fits:

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

FSPOR964TSMB

The product you are viewing cross references to these numbers

Fabspeed Sport Highflow Catalytic Converter.
The Fabspeed Porsche 964 Carrera Sport High-Flow Catalytic Converter is a performance replacement for an ageing, damaged, missing or restrictive factory catalytic converter.

Fits:

• Porsche 964 (911) C2 1989-94
• Porsche 964 (911) C4 1989-94 

Designed to maintain catalytic emissions treatment while providing a freer-flowing exhaust path, the system combines a modern high-flow catalyst with CNC mandrel-bent T304L stainless-steel construction.

Compared with simply removing the catalytic converter, this system provides a performance-oriented solution that retains a functioning catalyst while improving exhaust flow and enhancing the characteristic air-cooled Porsche flat-six exhaust note.

What This Product Does:
A catalytic converter forms part of the vehicle's exhaust and emissions-control system.

Exhaust gases produced during combustion contain pollutants that need to be converted into less harmful compounds before leaving the exhaust.

The catalytic converter performs this emissions-treatment process while allowing exhaust gases to continue towards the rear silencer.

The Fabspeed Sport High-Flow Catalytic Converter performs this fundamental function while using a less restrictive performance-oriented design.

It is designed to provide:

• Catalytic emissions treatment
• Improved exhaust-gas flow
• Reduced exhaust restriction
• Improved engine breathing
• Increased horsepower potential
• Increased torque potential
• Improved throttle response
• Reduced exhaust-system weight
• Enhanced air-cooled flat-six sound

High-Flow Catalyst Design:

• The internal catalyst structure provides a large surface area for the chemical reactions required to process exhaust pollutants.
• A performance catalyst is engineered to achieve this while reducing the restriction placed on exhaust gases.
• This is particularly useful on a performance vehicle, where excessive exhaust backpressure can restrict engine breathing as airflow requirements increase.
• The Fabspeed system therefore provides an alternative to both a restrictive ageing factory catalyst and a catalyst-delete pipe.

Performance Benefits:
Fabspeed reports dyno-tested gains of:

Crank Horsepower: +28 HP
Wheel Horsepower: +24 WHP
Torque: +16 ft-lb
Weight Reduction: Approx. 9 lb

Fabspeed states that the power improvement occurs throughout the RPM range rather than being concentrated solely at maximum engine speed.

These are manufacturer-reported figures from a specific test vehicle and should not be interpreted as guaranteed results for every Porsche 964.

Actual performance can vary according to:

• Engine condition
• Existing exhaust system
• Intake modifications
• ECU calibration
• Fuel quality
• Ambient conditions
• Vehicle specification
• Testing equipment and procedure

Why Upgrading Matters:
The Fabspeed Sport High-Flow Catalytic Converter can also be installed as a performance upgrade even when the original catalyst remains functional.

Potential benefits include:

• Reduced exhaust restriction
• Improved exhaust flow
• Increased horsepower potential
• Increased torque potential
• Improved throttle response
• Reduced exhaust-system weight
• More sporting exhaust sound
• Modern catalyst technology
• Retention of catalytic emissions treatment

This makes it an alternative for owners seeking improved exhaust performance without moving to a catalyst-delete configuration.

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

FSPOR964SC

The product you are viewing cross references to these numbers

Fabspeed Turbo Link Comp. Pipe. 

The Fabspeed Porsche 964 Turbo / 965 / C2 Turbo Cat Bypass Pipe is a high-performance stainless steel exhaust component developed for Porsche 911 Turbo models manufactured between 1990 and 1994.

Fits:

• Porsche 964 (911) TURBO 3.3L 1991-93
• Porsche 964 (911) TURBO 3.6L 1991-93  

Designed by Fabspeed Motorsport, this competition exhaust pipe replaces the original Porsche catalytic converter with a freer-flowing exhaust connection between the K27 turbocharger and the factory secondary muffler.

Manufactured from premium 14–16 gauge T304L stainless steel, the bypass pipe features CNC mandrel-bent tubing and a 3.0-inch (76 mm) diameter to support efficient exhaust gas flow.

Its design incorporates a four-bolt flange connection and follows the concept of Porsche's original racing exhaust components.

By replacing the restrictive factory catalytic converter, the Fabspeed bypass pipe is designed to reduce exhaust backpressure downstream of the turbocharger, improve exhaust gas flow and enhance the distinctive sound of the turbocharged air-cooled flat-six engine.

The freer-flowing arrangement allows more of the turbocharger's characteristic whistle and spool-up sound to be heard, creating a more pronounced sports car exhaust character.

Fabspeed describes the system as producing an engaging exhaust note without becoming excessively loud when used with the compatible original rear muffler arrangement.

The bypass pipe is designed as a direct bolt-on replacement, allowing the original catalytic converter to be retained separately and refitted when required.

Its stainless steel construction provides resistance to corrosion and thermal deterioration, making it suitable for demanding competition environments.

The product is intended for owners of Porsche 964 Turbo and 965 vehicles seeking a dedicated competition exhaust configuration rather than a standard road-going catalytic converter replacement.

Important: This product removes the factory catalytic converter and is intended exclusively for closed-course motorsport and off-road applications where permitted. It must not be used on public roads.

What This Product Does:
The Fabspeed Cat Bypass Pipe replaces the factory catalytic converter with a straight-through, high-flow exhaust section.

Its primary function is to reduce exhaust restriction after the turbocharger, supporting freer exhaust gas movement towards the remaining exhaust system.

Its main functions and benefits include:

• Improved Exhaust Gas Flow: Replaces the factory catalytic converter with a less restrictive exhaust passage.
• Reduced Exhaust Backpressure: Helps reduce resistance to exhaust gases downstream of the turbocharger.
• Enhanced Turbocharger Sound: Makes turbo spool-up and whistle more noticeable.
• Improved Performance Potential: Reduced exhaust restriction may support improved power delivery under suitable operating conditions.
• Throttle Response Potential: A less restrictive exhaust arrangement may influence turbocharger response, although results depend on the engine and overall configuration.
• Sportier Exhaust Character: Produces a more pronounced turbocharged flat-six exhaust sound.
• Large-Diameter Tubing: Features 3.0-inch (76 mm) exhaust tubing.
• Smooth Exhaust Routing: CNC mandrel-bent construction helps maintain consistent tube geometry through bends.
• Durable Construction: T304L stainless steel provides corrosion resistance and suitability for high exhaust temperatures.
• Competition-Oriented Design: Based on the concept of Porsche factory racing exhaust components.
• Direct Bolt-On Fitment: Uses the original-style mounting arrangement without requiring permanent modification to the vehicle.
• Reversible Installation: Allows the original catalytic converter to be reinstalled when returning the vehicle to its road-approved configuration.

Symptoms Of Wear Or Failure:
The Fabspeed Cat Bypass Pipe is primarily a competition performance upgrade, not a standard maintenance replacement.

However, deterioration of the original catalytic converter or surrounding exhaust components may prompt owners to inspect or repair the existing system.

Common symptoms of catalytic converter or exhaust system problems include:

1. Reduced Engine Performance

A damaged or restricted catalytic converter may create excessive exhaust backpressure, potentially reducing engine performance.

Possible signs include sluggish acceleration, reduced power under load and difficulty maintaining normal performance at higher engine speeds.

2. Restricted Exhaust Flow

A physically damaged or obstructed catalytic converter may prevent exhaust gases from passing through the system normally.

In severe cases, this can affect the performance of a turbocharged engine.

3. Metallic Rattling from the Exhaust

An ageing catalytic converter may develop damaged or loose internal components.

These can produce rattling or metallic noises, particularly during acceleration or changes in engine speed.

4. Visible Corrosion

Older exhaust components may develop rust or corrosion due to moisture, road salt and repeated heating and cooling.

Severe deterioration can weaken pipework, joints and mounting points.

5. Exhaust Leaks

Cracked components, deteriorated gaskets or damaged flange connections may allow exhaust gases to escape.

Symptoms can include unusual blowing noises, increased exhaust volume and escaping fumes.

6. Unusual Exhaust Smells

Changes in exhaust odour may indicate catalytic converter deterioration, an exhaust leak or an underlying engine combustion problem.

The cause should be diagnosed before replacing components.

7. Excessive Exhaust Heat

An internally restricted catalytic converter can contribute to abnormal temperature conditions within the exhaust system.

Severe overheating may damage surrounding components and should be investigated promptly.

8. Damaged Mounting Connections

Corroded fasteners, damaged flanges or deteriorated exhaust mountings may compromise the security of the original catalytic converter.

9. Poor Turbocharger Response

Excessive exhaust restriction can affect turbocharger operating conditions.

However, reduced boost response may also be caused by turbocharger wear, boost leaks, wastegate faults or fuel and ignition problems.

10. Visible Impact Damage

Ground clearance issues, road debris or previous accidents may damage the original catalytic converter or adjacent exhaust pipework.

Why Replacement / Upgrading Matters:

• Maintaining a correctly functioning exhaust system is important for engine performance, turbocharger operation, structural integrity and vehicle safety.
• On the Porsche 964 Turbo and 965, exhaust gases pass through the turbocharger before flowing into the downstream exhaust system.
• The factory catalytic converter reduces harmful exhaust emissions while also forming part of the original exhaust routing.
• In competition applications, a catalytic converter bypass may be used to reduce downstream exhaust restriction where permitted by motorsport regulations.

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.

FSPOR964TCB

The product you are viewing cross references to these numbers