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Fabspeed Exhaust
Bolt-on turbo-back exhaust system providing great sports car sound and improved exhaust flow.
FEATURES:
• Fits: all Porsche 964 Turbo 965 vehicles (1990-1994)
• Includes 4.5" T304 stainless steel waste-gate tip.
• Complete 3.0"/76.5mm tubing for maximum flow, improving horsepower and sound.
• Stainless steel mounting bracket and all necessary hardware for installation included.
• Bolts directly to the stock turbo.
• Direct-bolt on installation, no cutting or welding required.
• Dramatic improvement in turbo spool and sports car sound!
Please note: This is a special-order item manufactured to order. In some cases, please allow 4 – 5 weeks for the delivery. Special order items cannot be cancelled from this supplier once your order has been placed.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
FSPOR964TMAX
The product you are viewing cross references to these numbers
- Porsche 964 (911) TURBO 3.3L 1991-93
- Porsche 964 (911) TURBO 3.6L 1991-93
Direct bolt-on replacement upgrade for the Porsche 964 Turbo (965) factory exhaust tips; improves flow and enhances the vehicle's aesthetic.
FEATURES:
• Fits: all Porsche 964 Turbo 965 vehicles (1990-1994)
• Improves exhaust flow and sound by replacing the restrictive factory tips (pictured here) with a clean straight-through design
• Angle-cut 4.5" oval shape
• Polished to a mirror finish
• Constructed from high-quality 14-16 gauge C.N.C. mandrel-bent T304L stainless steel
• Simple DIY bolt-on installation
• All Fabspeed performance products are backed by the Fabspeed Lifetime Limited Warranty
Please note: This is a special-order item manufactured to order. In some cases, please allow 4 – 5 weeks for the delivery. Special order items cannot be cancelled from this supplier once your order has been placed.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
FSPOR964TOTP
The product you are viewing cross references to these numbers
- Porsche 964 (911) TURBO 3.3L 1991-93
- Porsche 964 (911) TURBO 3.6L 1991-93
Eliminates the restrictive catalytic converter on the wastegate for increased flow and improved wastegate sound characteristics.
FEATURES:
• Fits all 964 Turbo 965 C2 Turbo vehicles worldwide (1990-1994)
• Great sports car sound without being too loud
• Constructed from high-quality 14-16 gauge C.N.C. mandrel-bent T304L stainless steel for optimum flow and maximum durability
• Direct bolt-on installation
• 100% INTENDED for RACING COMPETITION events ONLY. Never ever to be driven or used on the public roads under any circumstances. NOT CARB approved NOT EPA approved and never will be approved. Caveat Emptor.
• All Fabspeed performance products are backed by the Fabspeed Lifetime Limited Warranty
DISCLAIMER: This product removes the OEM catalytic converters from the vehicle, and as such, is strictly intended for closed track events and off-road use only. This product is or contains a Racing Cat Bypass Pipe, which will give you check engine lights on OBD2 cars. We suggest pairing this product with racing software to prevent fault codes and check engine lights. Racing Cat Bypass Pipes are solely intended for track and race cars as they are NOT California Air Resources Board Certified and not EPA certified. You are hereby informed and warned to check your local, state, and federals laws before buying and installing these or any aftermarket parts to be sure whether usage is in violation. All installation-risk and use-risk is borne by the end-user and installer of these parts.
• 100% INTENDED for RACING COMPETITION events ONLY. Never ever to be driven or used on the public roads under any circumstances. NOT CARB approved NOT EPA approved and never will be approved. Caveat Emptor.
Please note: This is a special-order item manufactured to order. In some cases, please allow 4 – 5 weeks for the delivery. Special order items cannot be cancelled from this supplier once your order has been placed.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
FSPOR964TWGCB
The product you are viewing cross references to these numbers
- Porsche 964 (911) TURBO 3.3L 1991-93
- Porsche 964 (911) TURBO 3.6L 1991-93
The Fabspeed HJS High-Flow Sport Catalytic Converter is a performance exhaust upgrade for the Porsche 964 Turbo, C2 Turbo designed to replace an ageing, restrictive or previously removed original catalytic converter.
Fits:
- Porsche 964 (911) TURBO 3.3L 1990-94
- Porsche 964 (911) TURBO 3.6L 1990-94
At the heart of the system is a 200-cell HJS high-flow catalytic converter, engineered to reduce exhaust emissions while providing substantially less restriction than older factory catalyst technology. The system is manufactured using 14–16 gauge CNC mandrel-bent T304L stainless steel, providing a durable, corrosion-resistant exhaust path designed for improved gas flow.
By reducing exhaust restriction after the turbocharger, the sport catalyst can help the turbocharged flat-six breathe more efficiently, supporting improved throttle response and performance while retaining catalytic exhaust-gas treatment.
What This Product Does:
- Replaces the original catalytic converter section.
- Converts harmful exhaust pollutants before gases leave the exhaust system.
- Provides significantly greater exhaust flow than an ageing or restrictive factory catalyst.
- Reduces exhaust backpressure after the turbocharger.
- Helps improve throttle response.
- Can support improved turbo response and engine performance.
- Provides a performance-oriented alternative to an original 1990s catalytic converter.
- Restores catalytic-converter functionality on vehicles where the original catalyst has previously been removed.
- Uses a high-flow 200-cell HJS catalyst rather than a conventional dense factory-style catalyst.
- Uses stainless-steel construction for corrosion resistance and durability.
- Retains catalytic treatment while offering flow characteristics closer to a less restrictive exhaust system.
Fabspeed states that its HJS high-flow catalysts can flow at more than 90% of the rate of a straight pipe in applicable installations while still providing catalytic exhaust-gas treatment.
Symptoms Of Wear Or Failure:
An original catalytic converter can deteriorate internally after decades of heat cycles, vibration and exposure to exhaust gases.
Possible symptoms include:
- Noticeable loss of engine power.
- Poor throttle response.
- Sluggish turbo response.
- Engine feeling restricted at higher RPM.
- Difficulty achieving full boost or performance.
- Excessive exhaust backpressure.
- Increased exhaust temperatures.
- Rattling noises from inside the catalytic converter.
- Metallic noises caused by a loose or broken catalyst core.
- Strong or unusual exhaust smells.
- Failed emissions testing.
- Increased exhaust emissions.
- Catalyst housing becoming excessively hot.
- Reduced fuel economy.
- Engine running poorly under load.
- Visible corrosion or damage to the original converter.
- Exhaust leaks around the converter or flanges.
A partially blocked catalyst may allow the engine to run reasonably well at low speed but restrict exhaust flow increasingly as engine speed and load rise.
Why Replacement Matters:
The catalytic converter sits directly in the exhaust path, so its internal condition has a major influence on both emissions performance and exhaust flow.
As the catalyst ages, the internal substrate can deteriorate, melt, become contaminated or break apart. A damaged catalyst may become increasingly restrictive, creating excessive exhaust backpressure.
On a turbocharged engine, restriction after the turbocharger is particularly undesirable because the turbocharger must push exhaust gases through the converter.
Replacing a worn or restrictive converter can help restore:
- Proper exhaust flow.
- Turbocharger response.
- Throttle response.
- Engine performance.
- Exhaust-gas treatment.
- Correct operating temperatures.
- Reliable exhaust-system operation.
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.
FSPOR964TSC
The product you are viewing cross references to these numbers
- Porsche 964 (911) TURBO 3.3L 1991-93
- Porsche 964 (911) TURBO 3.6L 1991-93
The Fabspeed Porsche C2 Turbo / 965 / 964 Turbo Muffler Bypass IMSA Zork Tube is a competition-inspired performance exhaust upgrade designed for Porsche 911 Turbo models manufactured between 1990 and 1994.
Fits:
- Porsche 964 (911) TURBO 3.3L 1990-94
- Porsche 964 (911) TURBO 3.6L 1990-94
Developed by Fabspeed Motorsport, this high-flow exhaust component recreates the distinctive short exhaust outlet design associated with the legendary Porsche 934 IMSA and Le Mans racing cars of the late 1970s.
The IMSA Zork Tube replaces the original restrictive rear exhaust arrangement with a short, large-diameter outlet that directs exhaust gases away from the turbocharger with minimal downstream restriction.
Its design is intended to deliver maximum exhaust sound, improved turbocharger response and a dramatic motorsport-inspired driving experience.
Manufactured with 3.0-inch (76 mm) exhaust tubing, the Fabspeed Zork Tube features an integrated angle-cut outlet that can be adjusted to achieve the correct position beneath the rear bumper.
By reducing exhaust restrictions after the turbocharger, this system is designed to improve exhaust gas evacuation and allow the turbocharger to respond more freely.
Fabspeed advertises performance gains of up to 46 wheel horsepower and 65 lb-ft of torque, based on its published testing. Actual results depend on engine condition, vehicle specification, existing modifications and operating conditions.
One of the most distinctive features of this product is its sound. The Zork Tube creates an exceptionally loud, aggressive exhaust character, with pronounced turbocharger whistle, spool-up sounds, crackles, pops and exhaust burbles.
Unlike a conventional sports muffler, the IMSA Zork Tube prioritises exhaust flow and sound over noise reduction.
The direct-fit design uses four mounting nuts at the turbocharger connection and an adjustable slip-joint outlet, allowing straightforward installation on a compatible exhaust configuration.
The Fabspeed IMSA Zork Tube is ideally suited to Porsche 964 Turbo and 965 owners preparing vehicles for track days, motorsport events or dedicated competition use.
What This Product Does:
The Fabspeed IMSA Zork Tube provides a short, high-flow exhaust route from the turbocharger towards the rear of the vehicle.
Instead of passing exhaust gases through the standard rear muffler arrangement, the Zork Tube allows them to exit through a substantially less restrictive pipe.
Its key functions and benefits include:
- Reduced Exhaust Backpressure: Provides a freer-flowing outlet after the turbocharger.
- Improved Exhaust Gas Flow: Uses 3.0-inch (76 mm) tubing to support efficient exhaust evacuation.
- Enhanced Turbocharger Response: Reduced downstream restriction may help the turbocharger build boost more readily.
- Increased Performance Potential: Fabspeed advertises gains of up to 46 wheel horsepower and 65 lb-ft of torque.
- Aggressive Race-Inspired Sound: Produces an extremely loud exhaust note inspired by historic Porsche competition cars.
- Pronounced Turbo Whistle: Makes turbocharger spool-up and operating sounds considerably more noticeable.
- Exhaust Crackles and Pops: Allows more combustion-related exhaust sounds to be heard.
- Direct Exhaust Routing: Minimises the complexity and length of the downstream exhaust path.
- Reduced Exhaust System Weight: Eliminates heavier original exhaust components where replaced by the tube, although Fabspeed does not publish a confirmed weight-saving figure for this product.
- Adjustable Outlet Position: Features an angle-cut outlet with a slip-joint adjustment.
- Motorsport Appearance: Recreates the distinctive short exhaust arrangement associated with Porsche 934 IMSA race cars.
- Straightforward Installation: Designed to attach directly to the compatible turbocharger outlet arrangement.
- Reversible Modification: Allows original components to be retained and refitted when required.
Symptoms Of Wear Or Failure:
The Fabspeed IMSA Zork Tube is primarily a performance and motorsport upgrade, rather than a routine replacement for a worn exhaust component.
However, owners may consider replacing or refurbishing their original exhaust system when it shows signs of damage or deterioration.
- Older mufflers and exhaust pipes can develop corrosion following prolonged exposure to moisture, road salt and repeated temperature changes.
- Severe corrosion may weaken the exhaust housing, joints and mounting points.
- Cracked pipework, failed gaskets or damaged connections can allow exhaust gases to escape before reaching the intended outlet.
- Symptoms may include blowing noises, increased exhaust volume and visible soot around leaking joints.
- Internal baffles or other components inside an ageing muffler may become loose or damaged.
- This can produce metallic rattling, unusual vibrations or changes in exhaust sound.
- Damaged or obstructed exhaust components may restrict gas flow, increasing exhaust backpressure.
- Severe restriction can affect engine output and turbocharger operating conditions.
- A severely restricted exhaust system may contribute to slower boost response or reduced engine performance.
- However, these symptoms can also result from turbocharger wear, boost leaks, wastegate faults or other engine problems.
- Corroded fasteners, fractured brackets or deteriorated supports may allow unwanted exhaust movement.
- This can produce rattling, vibration or contact with surrounding bodywork.
- Impact damage, crushed sections or deformed pipework can compromise the structural condition of the original exhaust.
- Loose connections or failed supports may allow the exhaust system to move beyond its intended position.
- A leaking exhaust may allow fumes to escape near the engine compartment or vehicle body.
- Exhaust leaks should be investigated promptly because exhaust gases can contain dangerous carbon monoxide.
- Corrosion or deformation around flange connections may prevent the exhaust from sealing correctly.
Why Replacement / Upgrading Matters:
- Upgrading to the Fabspeed IMSA Zork Tube offers a distinctive motorsport-focused exhaust configuration for Porsche 964 Turbo and 965 models.
- The original Porsche exhaust system was engineered to balance performance, exhaust noise, emissions control and normal road usability.
- For dedicated competition vehicles, a shorter and less restrictive exhaust outlet may provide benefits where motorsport regulations permit its use.
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.
FSPOR964TZMB
The product you are viewing cross references to these numbers
- Porsche 964 (911) TURBO 3.3L 1991-93
- Porsche 964 (911) TURBO 3.6L 1991-93
The Fabspeed RENNKRAFT Sport Cat and Competition Link Pipe system is a performance exhaust upgrade designed for the Porsche 964 Turbo. It replaces the restrictive original catalytic converter section with Fabspeed's interchangeable RENNKRAFT system, allowing the exhaust configuration to be changed between an HJS 200-cell high-flow sport catalytic converter and a straight-through competition link pipe.
Fits:
- Porsche 964 (911) TURBO 3.3L 1990-94
- Porsche 964 (911) TURBO 3.6L 1990-94
The sport catalyst configuration is designed to improve exhaust flow while retaining catalytic exhaust-gas treatment, while the competition link pipe provides the least restrictive exhaust path for appropriate track and competition use.
The system retains the original Porsche rear mufflers, allowing the vehicle to preserve a largely factory rear appearance while benefiting from reduced exhaust restriction, a stronger exhaust character and more noticeable turbocharger sound.
Constructed from 3-inch, 14–16 gauge T304L stainless-steel tubing, the system uses CNC mandrel bends to maintain a smooth internal exhaust path and provide durability under the high temperatures generated by the turbocharged flat-six engine.
What This Product Does:
- Replaces the restrictive original catalytic-converter section.
- Provides interchangeable sport-cat and competition-pipe configurations.
- Uses a high-flow HJS 200-cell catalytic converter in the catted configuration.
- Reduces exhaust restriction after the turbocharger.
- Helps improve exhaust-gas flow.
- Can help reduce turbo lag.
- Supports improved turbocharger response.
- Produces a more pronounced exhaust note.
- Increases audible turbo whistle.
- Retains the original Porsche rear mufflers.
- Allows the vehicle to maintain a relatively factory-looking rear exhaust installation.
- Provides a straight-through competition configuration for suitable track applications.
- Uses stainless-steel construction for long-term corrosion resistance.
- Provides a direct replacement for the factory catalytic-converter section.
Fabspeed states that the HJS 200-cell catalyst flows approximately 93% as much as a straight pipe, providing a balance between catalytic treatment and performance-oriented exhaust flow.
Symptoms Of Wear Or Failure:
A Porsche 964 Turbo's original catalytic converter can deteriorate after decades of heat cycles, vibration and exposure to high exhaust temperatures.
Possible signs of deterioration or restriction include:
- Reduced engine power.
- Sluggish acceleration.
- Slow turbo response.
- Increased turbo lag.
- Engine feeling restricted at higher RPM.
- Poor performance under heavy load.
- Excessive exhaust backpressure.
- Increased exhaust-gas temperatures.
- Unusual heat around the catalytic converter.
- Rattling from inside the converter.
- Metallic noises caused by a loose catalyst substrate.
- Strong or unusual exhaust smells.
- Failed emissions testing.
- Increased exhaust emissions.
- Visible corrosion or damage to the converter housing.
- Exhaust leaks around flanges or joints.
A partially blocked catalyst may allow relatively normal operation at low engine speeds but increasingly restrict exhaust flow as engine speed and load increase.
Why Replacement Matters:
The catalytic converter sits directly downstream within the turbocharged exhaust system, meaning its ability to flow exhaust gases can have a significant influence on engine and turbocharger performance.
As an old catalyst deteriorates, its internal substrate can:
- Break apart.
- Become contaminated.
- Melt or deform.
- Collapse internally.
- Become increasingly restrictive.
A restricted catalyst creates additional pressure after the turbocharger, making it more difficult for exhaust gases to leave the turbine efficiently.
Replacing an ageing or restrictive factory catalyst with a correctly designed high-flow system can help restore:
- Efficient exhaust flow.
- Turbocharger response.
- Throttle response.
- High-RPM performance.
- Correct exhaust-system operation.
- More consistent engine performance.
- A stronger performance exhaust character.
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.
FSPOR964TSCCB
The product you are viewing cross references to these numbers
- Porsche 964 (911) TURBO 3.3L 1991-93
- Porsche 964 (911) TURBO 3.6L 1991-93
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:
- Porsche 964 (911) TURBO 3.3L 1990-94
- Porsche 964 (911) TURBO 3.6L 1990-94
Designed for both 3.3L and 3.6L Porsche 964 Turbo / 965 models, the bypass pipe reduces restriction in the rear exhaust system while retaining the vehicle's catalytic converter. This provides improved exhaust flow, sharper throttle response, reduced rear-end weight and a more pronounced turbocharged flat-six exhaust note.
Manufactured from 14–16 gauge CNC mandrel-bent T304L stainless steel, the pipe is a direct replacement for the original Porsche secondary muffler.
Fabspeed lists 12 HP and 10 lb-ft for this product and states that removing the factory secondary muffler saves approximately 25 lb / 11.4 kg from the rear of the vehicle. Performance figures are manufacturer-reported and actual results will vary according to vehicle specification, condition and testing environment.
What This Product Does:
The secondary muffler is positioned downstream of the catalytic converter and is primarily responsible for reducing exhaust noise before gases exit through the rear exhaust tip.
While effective at controlling sound, the internal chambers and passages of a conventional muffler can also create resistance to exhaust flow.
The Fabspeed Secondary Muffler Bypass Pipe removes this muffler and replaces it with a freer-flowing pipe.
The upgrade is designed to provide:
- Improved exhaust-gas flow
- Reduced rear exhaust restriction
- Improved throttle response
- Increased performance potential
- Reduced rear-end weight
- Stronger turbocharged flat-six exhaust sound
- More pronounced turbo whistle
- More direct exhaust path
Improved Exhaust Flow:
Replacing the factory secondary muffler removes internal chambers and sound-control structures from this section of the exhaust.
The resulting straighter exhaust route is designed to reduce restriction.
Potential benefits include:
- Faster exhaust-gas evacuation
- Reduced backpressure
- Improved turbo exhaust flow
- Sharper throttle response
- Improved performance throughout the RPM range
The exact difference will depend on the condition and specification of the complete engine and exhaust system.
Enhanced Turbocharged Flat-Six Sound:
Removing the secondary muffler allows considerably more of the 964 Turbo's natural exhaust character to be heard.
The result is a deeper and more pronounced turbocharged flat-six sound, accompanied by increased turbo whistle.
Drivers can expect:
- Deeper exhaust tone
- Increased exhaust presence
- Stronger sound under acceleration
- More noticeable turbo whistle
- More pronounced flat-six character
- Sportier overall exhaust note
The final sound will depend on the rest of the exhaust system fitted to the vehicle.
Why Upgrading Matters:
The original secondary muffler does not need to have failed before this component is installed.
This product is primarily a performance, sound and weight-reduction upgrade.
Reasons for upgrading include:
- Removes the restrictive factory secondary muffler
- Improves exhaust flow
- Improves throttle response potential
- Manufacturer-listed 12 HP / 10 lb-ft
- Approx. 25 lb / 11.4 kg rear weight saving
- Stronger turbocharged flat-six sound
- More noticeable turbo whistle
- Retains the catalytic converter
- T304L stainless-steel construction
- CNC mandrel-bent tubing
- Direct replacement for the factory secondary muffler
- Suitable for both 3.3L and 3.6L 964 Turbo applications
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.
FSPOR964TSMB
The product you are viewing cross references to these numbers
- Porsche 964 (911) TURBO 3.3L 1991-93
- Porsche 964 (911) TURBO 3.6L 1991-93
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
- Porsche 964 (911) TURBO 3.3L 1991-93
- Porsche 964 (911) TURBO 3.6L 1991-93
Fabspeed Exhaust Systems - Precision Performance & Sound Upgrades
Fabspeed Exhaust Systems are premium performance exhaust upgrades engineered to deliver increased power, improved exhaust flow, and a distinctive motorsport-inspired sound. Designed and manufactured with precision engineering and performance testing at their core, Fabspeed exhausts are built to enhance the driving experience of Porsche road and track vehicles alike.
Available from Design911, Porsche Fabspeed exhaust components are crafted using high-quality stainless steel and optimised designs to reduce backpressure, improve throttle response, and unleash a more engaging exhaust tone while maintaining durability and reliability.
What Do Fabspeed Exhaust Systems Do?
Fabspeed exhausts optimise exhaust gas flow and acoustic performance.
Core Functions:
- Reduce exhaust restriction and backpressure.
- Improve throttle response and power delivery.
- Enhance exhaust sound and character.
- Improve engine efficiency and breathing.
- Upgrade exhaust aesthetics and build quality.
A high-flow exhaust system plays a key role in unlocking engine performance.
Why Do Standard Exhaust Systems Fail or Limit Performance?
Factory exhaust systems are designed to prioritise emissions
compliance, cost efficiency, and sound suppression. Over time, they can suffer
from:
- Restrictive internal baffling reducing performance.
- Corrosion from moisture and repeated heat cycles.
- Excessive weight limiting efficiency.
- Muted exhaust sound lacking engagement.
- Reduced compatibility with performance tuning upgrades.
As engines are pushed harder, standard exhausts can become a performance bottleneck.
Why Upgrade to a Fabspeed Exhaust?
Fabspeed exhaust systems are designed for drivers seeking performance-focused enhancements.
Upgrade Benefits:
- Improved exhaust flow for increased performance.
- Sportier, more aggressive exhaust sound.
- Lightweight, durable stainless steel construction.
- Precision-engineered components for perfect fitment.
- Ideal for performance road cars and track applications.
Upgrading to Fabspeed delivers noticeable gains in sound, response, and driving excitement.
Highlights
- Porsche Fabspeed performance exhaust systems
- Improved exhaust flow and throttle response
- Sporty, motorsport-inspired exhaust sound
- High-quality stainless steel construction
- Designed for performance and enthusiast driving
