Fabspeed

The Fabspeed Primary Sport Catalytic Converter Downpipe is a high-performance replacement for the restrictive factory catalytic-converter downpipe fitted to the Porsche 971 Panamera Base V6 single-turbo model from 2017 onward.

Fits:

• Porsche 971.1 Panamera V6 3.0L 2WD (330 Hp) 2017-20
• Porsche 971.1 Panamera 4 V6 3.0L 4WD (330 Hp) 2017-20
• Porsche 971.1 Panamera 4 V6 3.0L 4WD Executive 2017-20
• Porsche 971.1 Panamera 4 3.0L Turbocharged V6 Sport Turismo 2017-20
• Porsche 971.1 Panamera 4S V6 3.0L 4WD (440 Hp) 2017-20
• Porsche 971.1 Panamera 4S V6 3.0L 4WD Executive 2017-20  

Designed to improve exhaust flow immediately downstream of the turbocharger, the system replaces the original catalyst section with a freer-flowing German HJS 200-cell tri-metallic high-performance catalytic converter.

The lower-density catalyst allows exhaust gases to pass through with significantly less restriction while still retaining catalytic exhaust treatment. This can help reduce post-turbo backpressure, improve throttle response, sharpen turbo response and produce a more pronounced performance exhaust note.

Fabspeed constructs the downpipe from 14–16 gauge CNC mandrel-bent T304 stainless steel, providing strong corrosion resistance, high-temperature durability and a smooth exhaust path.

What This Product Does:
The primary catalytic converter downpipe connects the turbocharger outlet to the remainder of the exhaust system.

It is designed to:

• Carry exhaust gases away from the turbocharger.
• Reduce restriction compared with the factory catalyst.
• Reduce post-turbo exhaust backpressure.
• Improve exhaust gas evacuation.
• Support quicker turbocharger response.
• Improve throttle response.
• Support increased horsepower and torque.
• Produce a stronger performance exhaust note.
• Retain catalytic exhaust treatment.
• Replace a damaged, restricted or deteriorated factory catalytic converter.
• Provide a durable stainless-steel exhaust upgrade.

• Check Engine Light.
• Catalyst-efficiency fault codes.
• Reduced engine performance.
• Sluggish acceleration.
• Slower turbo response.
• Loss of power at higher engine speeds.
• Increased exhaust backpressure.
• Metallic rattling from the catalytic converter.
• Unusual exhaust smell.
• Excessive catalyst temperature.
• Poor fuel economy.
• Failed emissions testing.
• Internal catalyst material breaking apart.
• Melted or collapsed catalyst substrate.

• Correct exhaust gas flow.
• Turbocharger efficiency.
• Engine performance.
• Proper catalytic operation.
• Exhaust-system sealing.
• Reliable emissions-system operation.

Upgrading to the Fabspeed sport catalyst additionally provides:

• Reduced exhaust restriction.
• Improved throttle response.
• Increased performance potential.
• Stronger exhaust sound.
• Durable stainless-steel construction.

The Fabspeed Center Muffler Bypass X-Pipe is a high-performance exhaust upgrade developed specifically for the Porsche 911 991.2 GT2 RS from 2018 onward, including Weissach and Manthey MR-equipped cars.

Fits:

• Porsche 991.2 GT2 RS 3.8L PDK (700 bhp) 2018-19

Designed to replace the factory titanium centre muffler, the system provides a freer-flowing exhaust path while retaining the vehicle's original catalytic converters.

At the centre of the system is Fabspeed's investment-cast X-pipe. The crossover allows exhaust gases from the two sides of the engine to merge through a carefully shaped central opening, helping reduce restriction, balance exhaust flow and produce a stronger, more exotic exhaust note.

The system is manufactured from 14–16 gauge T304 stainless steel with larger-diameter CNC mandrel-bent tubing. It provides a durable alternative to the original titanium centre muffler while increasing exhaust sound and supporting improved throttle response and performance.

Fabspeed currently lists a +20 HP performance gain for this product. Actual gains can vary according to vehicle condition, fuel, environmental conditions and other modifications.

What This Product Does:
The Fabspeed X-pipe replaces the original centre muffler in the rear exhaust system.

It is designed to:

• Reduce restriction through the centre exhaust section.
• Improve exhaust gas flow.
• Replace the factory titanium centre muffler.
• Increase exhaust volume.
• Produce a more dynamic GT2 RS exhaust note.
• Improve throttle response.
• Support increased engine performance.
• Retain the original catalytic converters.
• Maintain a catalyst-equipped exhaust configuration.
• Provide a durable stainless-steel replacement for the factory centre muffler.
• Allow straightforward installation and removal using the existing clamped exhaust arrangement.

• Metallic rattling.
• Exhaust blowing noises.
• Cracks around welds.
• Visible exhaust leakage.
• Soot around damaged joints.
• Increased exhaust noise.
• Muffler casing damage.
• Loose internal components.
• Exhaust vibration.
• Exhaust hanging incorrectly.
• Damaged inlet or outlet connections.
• Exhaust contacting surrounding components.
• Heat-related structural deterioration.

A damaged muffler should be inspected before continued high-load or track use.

Why Replacement Matters:
Replacing a damaged or restrictive centre muffler section helps restore:

• Correct exhaust sealing.
• Safe routing of hot exhaust gases.
• Proper exhaust alignment.
• Structural integrity.
• Consistent exhaust flow.
• Reliable mounting.

Upgrading to the Fabspeed X-pipe additionally provides:

• Increased exhaust sound.
• Reduced centre-section restriction.
• Improved throttle response.
• A more performance-focused exhaust character.
• Retention of the factory catalytic converters.

The Fabspeed Competition Link Pipes are a motorsport-focused catalyst-bypass exhaust upgrade designed for the Porsche 911 991.2 GT2 RS from 2018 onward.

Fits:

• Porsche 991.2 GT2 RS 3.8L PDK (700 bhp) 2018-19  

Developed for maximum exhaust flow and an uncompromised competition sound, the system replaces the restrictive factory ceramic catalytic converters with straight-through stainless-steel link pipes while retaining the car's Porsche Sport Exhaust – PSE – valve functionality.

The original GT2 RS uses approximately 700-cell ceramic catalytic converters. Removing these high-density catalysts creates a much less restrictive route for exhaust gases leaving the turbochargers.

This can reduce exhaust backpressure, increase turbocharger sound and provide considerably greater flow potential for highly tuned or competition vehicles.

Unlike basic straight pipes, the Fabspeed system incorporates large 74mm / 2.92in Helical Limited UK exhaust valves, compared with approximately 60mm / 2.375in factory valves.

These larger valves allow increased exhaust flow while retaining the ability to control the exhaust path through the Porsche PSE system.

What This Product Does:
The Fabspeed Competition Link Pipes replace the factory catalytic converter assemblies located downstream of the GT2 RS turbochargers.

They are designed to:

• Remove the restriction created by the factory catalytic converters.
• Reduce exhaust backpressure.
• Increase exhaust gas flow.
• Improve turbocharger outlet flow.
• Support quicker turbo response.
• Increase performance potential on tuned vehicles.
• Increase turbocharger whistle and spool sound.
• Produce a substantially louder exhaust note.
• Retain Porsche Sport Exhaust valve functionality.
• Replace the smaller factory exhaust valves with larger Helical valves.
• Reduce exhaust-system weight.
• Provide a modular competition exhaust configuration.

Possible symptoms include:

• Exhaust leaks.
• Ticking or blowing noises.
• Soot around joints or welds.
• Metallic rattling.
• Cracked welds.
• Damaged tubing.
• Loose clamps.
• Excessive exhaust movement.
• Pipes becoming misaligned.
• Contact with heat shields or bodywork.
• Exhaust valve rattling.
• Valve sticking.
• One exhaust bank sounding different from the other.
• PSE no longer changing the exhaust sound correctly.
• Excessive vibration around the valve assemblies.

Replacing worn or damaged components helps restore:

• Correct exhaust sealing.
• Proper valve function.
• Maximum intended flow.
• Consistent PSE operation.
• Correct pipe alignment.
• Safe clearance from nearby components.
• Structural integrity.

On a high-performance turbocharged vehicle, exhaust integrity is particularly important because of the high temperatures and gas velocities involved.

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.

The Fabspeed Valved Sport Catalytic Converters are a high-performance replacement for the factory catalytic converter assemblies fitted to the Porsche 911 991.2 GT2 RS from 2018 onward.

Fits:

• Porsche 991.2 GT2 RS 3.8L PDK (700 bhp) 2018-19

Designed specifically for the high-output twin-turbocharged GT2 RS, the system replaces the restrictive factory 700-cell ceramic catalytic converters with significantly freer-flowing German HJS 200 CPSI sport catalytic converters.

The reduced catalyst density allows exhaust gases to pass through the system with less restriction, helping reduce backpressure downstream of the turbochargers, improve turbo response and provide a stronger, more aggressive exhaust note.

Unlike a basic high-flow catalyst conversion, the Fabspeed system also retains the car's Porsche Sport Exhaust (PSE) functionality through high-temperature Helical UK exhaust valves.

Fabspeed uses larger exhaust valves than the factory arrangement to increase available exhaust flow when the valves are open while maintaining driver-controlled exhaust operation.

The system is constructed from 14–16 gauge CNC mandrel-bent T304 stainless steel and bolts directly to the original GT2 RS titanium centre muffler.

What This Product Does:
The sport catalytic converter system replaces the original catalytic converter assemblies immediately downstream of the turbochargers.

It is designed to:

• Reduce exhaust restriction.
• Reduce turbocharger outlet backpressure.
• Improve exhaust gas flow.
• Support quicker turbocharger response.
• Improve throttle response.
• Support increased horsepower and torque.
• Produce a stronger GT2 RS exhaust note.
• Retain catalytic exhaust treatment.
• Maintain Porsche Sport Exhaust functionality.
• Replace restrictive, damaged or failed factory catalytic converters.
• Work with the original Porsche titanium centre muffler.
• Provide a direct bolt-on performance upgrade.

• Check Engine Light.
• Catalyst-efficiency fault codes.
• Reduced engine performance.
• Slower turbo response.
• Engine feeling restricted under boost.
• Reduced high-RPM power.
• Excessive exhaust backpressure.
• Metallic rattling from the catalyst.
• Unusual exhaust smell.
• Excessive catalyst temperature.
• Internal catalyst substrate breaking apart.
• Melted or collapsed catalyst material.
• Failed emissions testing where applicable.

Catalyst faults should always be correctly diagnosed because a failed catalyst may be the result of another engine problem rather than the original cause.

Why Replacement / Upgrading Matters:
Replacing restrictive or failed catalytic converters with a properly designed high-flow system can help restore or improve:

• Exhaust gas flow.
• Turbocharger response.
• Throttle response.
• Engine performance.
• High-RPM breathing.
• Exhaust sound.
• Catalyst reliability.
• Porsche Sport Exhaust functionality.

For performance-modified GT2 RS vehicles, reduced catalyst restriction can also provide greater headroom for additional engine tuning.

The Fabspeed Deluxe Dual Style Tips are a premium exhaust-tip upgrade designed specifically for the Porsche 911 991.2 GT3 and GT3 RS from 2017–2019.

Fits:

• Porsche 991.2 GT3 4.0L (500 Bhp) / GT3 RS 4.0L (520 Bhp) 2017-19  

Designed as a straightforward bolt-on upgrade, the tips can be installed with the original Porsche centre muffler or with compatible aftermarket exhaust systems that accept the standard factory-style exhaust-tip arrangement.

The system uses a lightweight holder plate and is available in several finish options, allowing the exhaust appearance to be matched to the individual vehicle.

What This Product Does:
The Fabspeed Deluxe Dual Style Tips replace the visible factory exhaust outlets at the rear of the vehicle.

They are designed to:

• Increase exhaust-tip diameter from approximately 88mm to 100mm.
• Give the rear bumper a more aggressive appearance.
• Provide a more substantial motorsport-inspired exhaust outlet.
• Replace worn, damaged or cosmetically deteriorated factory tips.
• Maintain factory-style mounting.
• Work with the original Porsche centre muffler.
• Work with compatible aftermarket exhaust systems.
• Allow the owner to choose a finish that complements the vehicle.
• Provide a lightweight replacement tip assembly.
• Improve exhaust-tip presentation without requiring replacement of the complete exhaust system.

Possible signs include:

• Heavy carbon and soot accumulation.
• Permanent staining.
• Corrosion.
• Surface pitting.
• Peeling or deterioration of a coated finish.
• Scratches.
• Dents.
• Impact damage.
• Cracks.
• Loose mounting hardware.
• Excessive tip movement.
• Rattling.
• Exhaust tips sitting unevenly.
• One outlet protruding further than the other.
• Contact with the rear bumper or diffuser.
• Heat damage around surrounding trim.
• Carbon-fibre finish becoming damaged or discoloured.

• Correct exhaust outlet alignment.
• Secure mounting.
• Proper bumper clearance.
• Clean rear-end appearance.
• Consistent left-to-right symmetry.
• The intended premium appearance of the GT3 or GT3 RS.

For a performance-focused vehicle where the centrally mounted exhaust outlets are a prominent styling feature, worn or damaged tips can significantly affect the overall appearance of the rear of the car.

The Fabspeed Race Competition Exhaust System Package is a complete headers-to-exhaust-tips performance system developed specifically for the Porsche 911 991.2 Speedster.

Fits:

• Porsche 991.2 Speedster 4.0L (510Bhp) 2019  

Designed primarily for competition and closed-course use, this system replaces the restrictive factory exhaust arrangement with a lightweight, high-flow configuration incorporating equal-length headers, high-velocity merge collectors and large-diameter exhaust tubing.

Unlike a conventional cat-back system, this package replaces a much greater proportion of the exhaust system. It removes the original catalytic converters and uses a racing catalyst-bypass configuration to create a significantly less restrictive exhaust path.

The result is an extremely aggressive, motorsport-focused exhaust character with substantially increased volume, stronger flat-six presence and reduced exhaust-system weight.

Fabspeed describes the system as an all-out race exhaust and advises that increased cabin drone and reduced day-to-day refinement should be expected.

What This Product Does:
The Fabspeed Race Competition Exhaust System is designed to provide a freer-flowing exhaust route from the cylinder heads through to the rear exhaust outlets.

It is designed to:

• Replace the factory headers and rear exhaust system.
• Reduce exhaust restriction.
• Reduce exhaust backpressure.
• Improve exhaust gas evacuation.
• Provide equal-length exhaust routing.
• Improve exhaust pulse management.
• Produce a much louder and more aggressive flat-six exhaust note.
• Reduce exhaust-system weight.
• Remove the restriction associated with the factory catalytic converters.
• Provide a motorsport-focused exhaust configuration.
• Support additional performance modifications.
• Provide several exhaust-tip configurations to suit appearance or track requirements.

• Exhaust leaks.
• Ticking or blowing noises.
• Unexpected increase in exhaust volume.
• Rattling beneath the vehicle.
• Metallic vibration.
• Cracked welds.
• Damaged tubing.
• Loose collector springs.
• Exhaust joints becoming loose.
• Soot deposits around flanges or joints.
• Exhaust tips becoming misaligned.
• Excessive exhaust movement.
• Broken mounting brackets.
• Exhaust contacting the body or heat shields.
• Unusual exhaust fumes around the vehicle.
• Loss of exhaust-system structural integrity.

Replacing damaged exhaust components helps restore:

• Correct exhaust sealing.
• Intended gas flow.
• Proper component alignment.
• Structural integrity.
• Correct ground and body clearance.
• Consistent exhaust sound.
• Safe routing of hot exhaust gases.

On a competition vehicle, these factors become especially important because the system experiences prolonged high exhaust temperatures and aggressive driving loads.

Fabspeed Sport Catalytic Converters With Muffler Adapter.
The Fabspeed Sport Catalytic Converters with Muffler Adapter are a high-performance exhaust upgrade designed for the Porsche 911 992 Turbo and Turbo S from 2021 onward.

Fits:

• Porsche 992.1 Turbo 3.8L 2021-24
• Porsche 992.1 Turbo S 3.8L 2021-24
• Porsche 992.1 Turbo Cabriolet 3.8L 2021-24
• Porsche 992.1 Turbo S Cabriolet 3.8L 2021-24  

By reducing exhaust restriction downstream of the turbochargers, the system allows exhaust gases to leave the engine more efficiently. This can improve turbocharger response, increase power and torque, reduce exhaust-system weight and produce a substantially more aggressive exhaust note.

Fabspeed's design replaces the original approximately 800-cell catalytic converters with significantly freer-flowing HJS catalysts while retaining catalytic exhaust treatment.

Fabspeed reports dyno gains of up to 47.7 WHP and 47.1 lb-ft of torque, with approximately 54 HP claimed at the crank on its test vehicle. Actual results vary according to vehicle condition, fuel, environmental conditions and accompanying modifications.

What This Product Does:
The catalytic converter sits downstream of the turbocharger and performs two important functions:

• It treats exhaust gases before they leave the vehicle.
• It forms part of the exhaust path through which the turbocharger must discharge exhaust flow.

The Fabspeed system is designed to:

• Reduce restriction after the turbochargers.
• Increase exhaust gas flow.
• Reduce backpressure.
• Improve turbocharger response.
• Allow the VTG turbochargers to spool more quickly.
• Support increased horsepower and torque.
• Increase exhaust volume and character.
• Produce more noticeable turbocharger sound.
• Increase burbles and overrun sound.
• Reduce exhaust-system weight.
• Retain catalytic exhaust treatment.

Possible symptoms include:

• Check Engine Light.
• Catalyst-efficiency fault codes.
• Loss of engine power.
• Slower turbo response.
• Increased exhaust backpressure.
• Reduced performance at higher RPM.
• Metallic rattling from inside the catalyst.
• Unusual exhaust smells.
• Excessively high catalyst temperatures.
• Internal catalyst material breaking apart.
• Melted or collapsed catalyst substrate.
• Engine feeling restricted under boost.
• Uneven exhaust flow.
• Failed emissions testing where applicable.

A failing catalyst should be diagnosed properly before replacement because engine-management, fueling or ignition faults may have caused the damage.

Why Replacement / Upgrading Matters:
Replacing restrictive or deteriorated catalysts with a high-flow sport catalyst system can help restore or improve:

• Exhaust gas flow.
• Turbocharger response.
• Power and torque.
• High-load performance.
• Exhaust sound.
• Exhaust-system weight.
• Catalyst reliability.
• Overall performance character.

The Fabspeed Sport Catalytic Converters with GT2RS Style Outlets + Muffler Adapter are a high-performance exhaust upgrade designed for the Porsche 911 992 Turbo and Turbo S from 2021 onward.

Fits:

• Porsche 992.1 Turbo 3.8L 2021-24
• Porsche 992.1 Turbo S 3.8L 2021-24
• Porsche 992.1 Turbo Cabriolet 3.8L 2021-24
• Porsche 992.1 Turbo S Cabriolet 3.8L 2021-24  

By reducing exhaust restriction downstream of the turbochargers, the system allows exhaust gases to leave the engine more efficiently. This can improve turbocharger response, increase power and torque, reduce exhaust-system weight and produce a substantially more aggressive exhaust note.

Fabspeed's design replaces the original approximately 800-cell catalytic converters with significantly freer-flowing HJS catalysts while retaining catalytic exhaust treatment.

The GT2RS-style outlets create a direct, low-restriction route from the sport catalysts towards the exhaust tips, effectively providing the most free-flowing configuration available within this Fabspeed system while retaining catalytic converters.

Fabspeed reports dyno gains of up to 47.7 WHP and 47.1 lb-ft of torque, with approximately 54 HP claimed at the crank on its test vehicle. Actual results vary according to vehicle condition, fuel, environmental conditions and accompanying modifications.

What This Product Does:
The catalytic converter sits downstream of the turbocharger and performs two important functions:

• It treats exhaust gases before they leave the vehicle.
• It forms part of the exhaust path through which the turbocharger must discharge exhaust flow.

The Fabspeed system is designed to:

• Reduce restriction after the turbochargers.
• Increase exhaust gas flow.
• Reduce backpressure.
• Improve turbocharger response.
• Allow the VTG turbochargers to spool more quickly.
• Support increased horsepower and torque.
• Increase exhaust volume and character.
• Produce more noticeable turbocharger sound.
• Increase burbles and overrun sound.
• Reduce exhaust-system weight.
• Retain catalytic exhaust treatment.
• Replace the factory rear muffler arrangement with GT2RS-style direct outlets.

Possible symptoms include:

• Check Engine Light.
• Catalyst-efficiency fault codes.
• Loss of engine power.
• Slower turbo response.
• Increased exhaust backpressure.
• Reduced performance at higher RPM.
• Metallic rattling from inside the catalyst.
• Unusual exhaust smells.
• Excessively high catalyst temperatures.
• Internal catalyst material breaking apart.
• Melted or collapsed catalyst substrate.
• Engine feeling restricted under boost.
• Uneven exhaust flow.
• Failed emissions testing where applicable.

A failing catalyst should be diagnosed properly before replacement because engine-management, fueling or ignition faults may have caused the damage.

Why Replacement / Upgrading Matters:
Replacing restrictive or deteriorated catalysts with a high-flow sport catalyst system can help restore or improve:

• Exhaust gas flow.
• Turbocharger response.
• Power and torque.
• High-load performance.
• Exhaust sound.
• Exhaust-system weight.
• Catalyst reliability.
• Overall performance character.

The GT2RS-style outlet configuration also removes much of the restriction and weight associated with the standard rear muffler arrangement.

The Fabspeed Cat-Back Valved Maxflo Exhaust System is a high-performance replacement exhaust system designed for the Porsche 911 992 Turbo and Turbo S from 2021 onward, including the Turbo “50 Years” edition.

Fits:

• Porsche 992.1 Turbo 3.8L 2021-24
• Porsche 992.1 Turbo S 3.8L 2021-24
• Porsche 992.1 Turbo Cabriolet 3.8L 2021-24
• Porsche 992.1 Turbo S Cabriolet 3.8L 2021-24  

Engineered to improve exhaust flow, reduce weight and provide a more distinctive turbocharged Porsche exhaust note, the system replaces the restrictive rear section of the factory exhaust while retaining the Porsche Sport Exhaust valve functionality.

When the PSE system is switched off and the exhaust valves are closed, the system provides a quieter and more refined exhaust character suitable for normal road and motorway driving.

When PSE is activated and the valves open, exhaust gases are given a less restrictive path through the system, producing a deeper, more aggressive exhaust note with greater turbo presence, sharper sound and increased volume.

The system is manufactured from CNC mandrel-bent T304L stainless steel and incorporates Fabspeed's cast X-pipe together with Helical Limited aerospace-grade exhaust valves.

Fabspeed's dyno testing recorded gains of up to +48.7 WHP and +53.7 lb-ft of torque, with approximately 55 HP claimed at the crank, although actual results vary according to vehicle specification, fuel, atmospheric conditions and associated modifications.

The system also saves approximately 9.8 lb / 4.4 kg compared with the factory exhaust.

What This Product Does:
The cat-back exhaust carries exhaust gases from the catalytic converter outlets through the rear exhaust system and out of the vehicle.

The Fabspeed Valved Maxflo system is designed to:

• Reduce restriction in the factory rear exhaust system.
• Improve exhaust gas flow.
• Reduce exhaust backpressure.
• Improve turbocharger exhaust flow.
• Support stronger throttle response.
• Support increased horsepower and torque.
• Provide a more aggressive exhaust note when required.
• Retain a quieter exhaust mode for everyday driving.
• Maintain integration with the Porsche PSE system.
• Reduce exhaust-system weight.
• Replace the factory muffler and associated rear exhaust pipework.
• Work with either factory catalysts or compatible Fabspeed sport catalysts.

Symptoms Of Wear Or Failure:
Possible signs of deterioration in the original or aftermarket cat-back exhaust include:

• Exhaust becoming noticeably louder without the valves being commanded open.
• Ticking or blowing noises from exhaust joints.
• Exhaust gases escaping around clamps or flanges.
• Soot marks around exhaust connections.
• Metallic rattling from the rear of the vehicle.
• Exhaust vibration.
• Loose exhaust components.
• Cracked welds.
• Damaged exhaust tubing.
• Corrosion or perforation.
• Exhaust system hanging lower than normal.
• Exhaust tips becoming misaligned.
• Excessive movement during acceleration.
• Increased cabin drone.
• Burning smell caused by exhaust gases or hot components contacting surrounding materials.
• Valve-related noises.
• Exhaust valves failing to open or close.
• Different exhaust sound between the two sides of the vehicle.
• PSE operation no longer changing the exhaust sound correctly.

Replacing a worn factory system or upgrading to the Fabspeed Valved Maxflo system can help restore or improve:

• Exhaust flow.
• Turbocharged engine response.
• Exhaust sound.
• PSE valve functionality.
• Exhaust-system sealing.
• Rear exhaust weight.
• Corrosion resistance.
• Overall exhaust durability.

For performance vehicles, maintaining a structurally sound and properly sealed exhaust is particularly important because exhaust gas temperatures and flow rates can be substantial.

The Fabspeed Porsche 991 GT3 Cup Sport Headers are a high-performance replacement for the restrictive factory exhaust headers fitted to Porsche 991 GT3 Cup race cars from 2017 onward.

Fits:

• Porsche 991 GT3 Cup 2017-2019

Designed specifically for competition-focused GT3 Cup applications, these headers improve exhaust gas flow and scavenging, helping the naturally aspirated flat-six engine breathe more efficiently throughout the rev range.

The system features one-piece CNC mandrel-bent primary header tubes, a high-velocity motorsport-style merge collector and specially designed inlet flanges. Fabspeed manufactures the system from a combination of T321 and T304 stainless steel for strength, corrosion resistance and durability under extreme exhaust temperatures.

Integrated German-made HJS 200-cell tri-metallic sport catalytic converters provide substantially increased exhaust flow compared with more restrictive factory catalysts while retaining catalytic treatment.

Fabspeed lists a performance gain of up to approximately 15 HP, although actual output will vary according to vehicle specification, setup and operating conditions. The system also removes approximately 1 kg / 2 lb from the rear of the vehicle compared with the factory arrangement.

What This Product Does:
The exhaust headers collect combustion gases as they leave the engine's individual cylinders and direct them into the remainder of the exhaust system.

On a high-revving GT3 Cup engine, efficient exhaust flow is especially important because the engine must move large volumes of exhaust gas at high RPM.

The Fabspeed Sport Headers are designed to:

• Reduce exhaust restriction.
• Improve exhaust gas velocity.
• Improve cylinder scavenging.
• Reduce pumping losses.
• Support stronger high-RPM performance.
• Improve throttle response.
• Increase potential horsepower.
• Maintain efficient exhaust flow during sustained track use.
• Reduce unnecessary weight at the rear of the vehicle.
• Provide high-flow catalytic treatment through HJS sport catalysts.

Possible symptoms of worn or damaged headers include:

• Ticking or tapping noise from the exhaust area.
• Exhaust note becoming louder than normal.
• Exhaust gases leaking near the cylinder heads.
• Soot marks around header flanges.
• Cracks in the header tubing.
• Cracked welds.
• Distorted mounting flanges.
• Loose mounting hardware.
• Failed exhaust gaskets.
• Rattling from the catalytic converter area.
• Reduced throttle response.
• Loss of high-RPM performance.
• Increased exhaust backpressure.
• Engine-management warning lights.
• Catalyst-efficiency fault codes.
• Unusual exhaust smells.
• Excessive heat around nearby components.

Because GT3 Cup vehicles are subjected to sustained competition use, regular inspection of the exhaust system is particularly important.

Why Replacement / Upgrading Matters:
A GT3 Cup engine depends on efficient airflow at both the intake and exhaust sides of the combustion process.

Restrictive, cracked or damaged headers can reduce the efficiency with which exhaust gases leave the engine.

Replacing worn components or upgrading to a higher-flow header system can help restore or improve:

• Exhaust gas flow.
• Cylinder scavenging.
• Engine responsiveness.
• High-RPM power delivery.
• Exhaust sealing.
• Thermal management.
• Competition reliability.
• Overall exhaust-system efficiency.

For a race car, maintaining predictable performance across repeated high-load sessions is especially important.

The Fabspeed Porsche 911 GT3 Cup Sport Headers are a high-performance replacement for the restrictive factory exhaust headers fitted to 997 and 991.1-generation Porsche 911 GT3 Cup race cars from 2007–2016.

Fits:

• Porsche 997 MK1 GT3 CUP 2007-09
• Porsche 911 (997) GT3 CUP 2010
• Porsche 991 GT3 Cup 2016

Designed specifically for competition-focused GT3 Cup applications, the system improves exhaust gas flow and scavenging to help the naturally aspirated flat-six engine breathe more efficiently throughout the rev range. The result is improved throttle response and the potential for increased power and torque.

Each header assembly incorporates German-made 200-cell HJS tri-metallic high-flow sport catalytic converters. These performance catalysts are designed to offer substantially less exhaust restriction than conventional catalysts while retaining catalytic treatment of the exhaust gases.

The headers are manufactured from high-quality 14–16 gauge stainless steel using CNC mandrel-bent tubing and feature high-velocity 3-into-1 pyramidal investment-cast merge collectors. This collector design is intended to improve exhaust scavenging as the individual cylinder exhaust pulses combine.

Fabspeed lists gains of up to 22 HP and 37 units of torque for this product, although actual results depend on the vehicle, engine specification, environmental conditions and accompanying modifications. The manufacturer also lists a reduction in weight compared with the factory arrangement.

What This Product Does:
The exhaust headers collect exhaust gases leaving each cylinder and direct them towards the remainder of the exhaust system.

On a high-revving naturally aspirated race engine such as the GT3 Cup flat-six, header design has a significant effect on the speed and efficiency with which exhaust gases leave the combustion chambers.

The Fabspeed Sport Headers are designed to:

• Reduce restriction compared with the factory header arrangement.
• Improve exhaust gas velocity.
• Promote more effective cylinder scavenging.
• Reduce exhaust backpressure.
• Allow the engine to expel combustion gases more efficiently.
• Improve throttle response.
• Support increased horsepower and torque.
• Maintain high exhaust flow at elevated engine speeds.
• Improve performance across the usable RPM range.
• Provide high-flow catalytic conversion through the HJS sport catalysts.

Possible symptoms of deteriorated factory or aftermarket headers include:

• Ticking or tapping noises from the exhaust area.
• Exhaust noise becoming louder than normal.
• Exhaust gases escaping around the cylinder-head flange.
• Soot deposits around header joints or welds.
• Cracks in the header tubing.
• Cracked or damaged welds.
• Distorted exhaust flanges.
• Loose header fasteners.
• Damaged exhaust gaskets.
• Rattling noises from the catalytic converters.
• Metallic noises from loose catalyst material.
• Reduced engine performance.
• Slower throttle response.
• Increased exhaust backpressure.
• Engine-management warning lights.
• Catalyst-efficiency fault codes.
• Unusual exhaust smells.
• Excessive heat around surrounding components.

Race cars should be inspected regularly because repeated high-temperature track operation can accelerate fatigue of exhaust components.

Why Replacement / Upgrading Matters:
Efficient exhaust flow is essential to extracting maximum performance from a GT3 Cup engine.

A restrictive, damaged or leaking exhaust header can interfere with exhaust scavenging and reduce engine efficiency.

Replacing worn factory components or upgrading to the Fabspeed Sport Headers can help restore or improve:

• Exhaust gas flow.
• Cylinder scavenging.
• Throttle response.
• High-RPM performance.
• Engine breathing.
• Power and torque potential.
• Exhaust-system sealing.
• Competition reliability.

For a race vehicle, consistent performance is as important as peak output. Exhaust leaks or deteriorating components can become progressively worse under sustained track temperatures.

The Fabspeed Sport Catalytic Converters with GT2RS Style Outlets + Muffler Adapter are a high-performance exhaust upgrade for the Porsche 911 992 Carrera, designed to reduce exhaust restriction, improve turbo response and deliver a significantly more sporting exhaust character.

Fits:

• Porsche 992.1 Carrera 2 3.0L 2021-24
• Porsche 992.1 Carrera 4 3.0L 2021-24
• Porsche 992.1 Carrera 2 Cabriolet 3.0L 2021-24
• Porsche 992.1 Carrera 4 Cabriolet 3.0L 2021-24
• Porsche 992.2 Carrera 2 3.0L 2024>>  

Manufactured from CNC mandrel-bent 14–16 gauge T304L stainless steel, the system is engineered as a direct bolt-on installation with no cutting or welding required.

What This Product Does:

• Replaces the factory catalytic-converter assemblies.
• Replaces the restrictive original 800-cell catalysts with HJS 200-CPSI units.
• Reduces exhaust backpressure.
• Allows exhaust gases to leave the turbochargers more efficiently.
• Helps improve turbocharger response.
• Supports increased horsepower and torque.
• Creates a more aggressive sports-car exhaust note.
• Increases audible turbocharger sound.
• Uses GT2RS-inspired direct exhaust outlets.
• Retains catalytic exhaust treatment.
• Reduces exhaust-system weight.
• Provides a modular design that can be converted back to a muffled configuration.
• Retains compatibility with the factory muffler using optional adapter pipes.
• Can also be configured with Fabspeed's Valvetronic exhaust.
• Provides a bolt-on installation without cutting or welding.

Fabspeed's HJS catalysts use a much more open internal structure than the original 800-cell units, helping the turbocharged 992 engine move exhaust gases more efficiently.

Symptoms Of Wear Or Failure:
The Fabspeed system is primarily a performance upgrade, but replacement may also be appropriate when the original catalytic converters have deteriorated.

Possible symptoms of a failing or restricted catalyst include:

• Reduced engine power.
• Sluggish acceleration.
• Increased turbo lag.
• Poor throttle response.
• Engine feeling restricted at higher RPM.
• Difficulty producing normal power under heavy load.
• Check engine warning light.
• Catalyst-efficiency fault codes.
• Rattling or metallic noises from inside a catalytic converter.
• Excessive heat from the catalyst housing.
• Strong or unusual exhaust odours.
• Increased emissions.
• Failed emissions testing.
• Exhaust leaks around joints or flanges.
• Visible damage to the catalyst housing.
• Poor fuel economy.
• Abnormally high exhaust backpressure.

A partially blocked catalyst may be relatively difficult to notice during light driving but become increasingly restrictive as exhaust-gas volume rises under acceleration.

Why Replacement Matters:
Catalytic converters sit directly downstream of the turbochargers and therefore have a significant influence on exhaust flow.

If the internal substrate becomes damaged, contaminated, melted or partially blocked, exhaust gases cannot pass through efficiently.

This increases backpressure and can result in:

• Reduced engine performance.
• Slower turbo response.
• Increased exhaust temperatures.
• Poor high-RPM performance.
• Increased load on the turbocharged exhaust system.
• Engine-management faults.
• Reduced emissions-control effectiveness.

Replacing a damaged or restrictive catalyst restores a clear exhaust path and proper catalytic function.

The Fabspeed Sport Catalytic Converters With Muffler Adapter Only are a high-performance exhaust upgrade for the Porsche 911 992 Carrera, designed to reduce exhaust restriction, improve turbo response and deliver a significantly more sporting exhaust character.

Fits:

• Porsche 992.1 Carrera 2 3.0L 2021-24
• Porsche 992.1 Carrera 4 3.0L 2021-24
• Porsche 992.1 Carrera 2 Cabriolet 3.0L 2021-24
• Porsche 992.1 Carrera 4 Cabriolet 3.0L 2021-24
• Porsche 992.2 Carrera 2 3.0L 2024>>  

Fabspeed's modular design also provides flexibility. The adapter pipes, allow the sport catalysts to be used with the factory rear muffler or Fabspeed Valvetronic exhaust if a quieter configuration is preferred.

Manufactured from CNC mandrel-bent 14–16 gauge T304L stainless steel, the system is engineered as a direct bolt-on installation with no cutting or welding required.

What This Product Does:

• Replaces the factory catalytic-converter assemblies.
• Replaces the restrictive original 800-cell catalysts with HJS 200-CPSI units.
• Reduces exhaust backpressure.
• Allows exhaust gases to leave the turbochargers more efficiently.
• Helps improve turbocharger response.
• Supports increased horsepower and torque.
• Creates a more aggressive sports-car exhaust note.
• Increases audible turbocharger sound.
• Retains catalytic exhaust treatment.
• Reduces exhaust-system weight.
• Provides a modular design that can be converted back to a muffled configuration.
• Retains compatibility with the factory muffler using optional adapter pipes.
• Can also be configured with Fabspeed's Valvetronic exhaust.
• Provides a bolt-on installation without cutting or welding.

Fabspeed's HJS catalysts use a much more open internal structure than the original 800-cell units, helping the turbocharged 992 engine move exhaust gases more efficiently.

Symptoms Of Wear Or Failure:
The Fabspeed system is primarily a performance upgrade, but replacement may also be appropriate when the original catalytic converters have deteriorated.

Possible symptoms of a failing or restricted catalyst include:

• Reduced engine power.
• Sluggish acceleration.
• Increased turbo lag.
• Poor throttle response.
• Engine feeling restricted at higher RPM.
• Difficulty producing normal power under heavy load.
• Check engine warning light.
• Catalyst-efficiency fault codes.
• Rattling or metallic noises from inside a catalytic converter.
• Excessive heat from the catalyst housing.
• Strong or unusual exhaust odours.
• Increased emissions.
• Failed emissions testing.
• Exhaust leaks around joints or flanges.
• Visible damage to the catalyst housing.
• Poor fuel economy.
• Abnormally high exhaust backpressure.

A partially blocked catalyst may be relatively difficult to notice during light driving but become increasingly restrictive as exhaust-gas volume rises under acceleration.

Why Replacement Matters:
Catalytic converters sit directly downstream of the turbochargers and therefore have a significant influence on exhaust flow.

If the internal substrate becomes damaged, contaminated, melted or partially blocked, exhaust gases cannot pass through efficiently.

This increases backpressure and can result in:

• Reduced engine performance.
• Slower turbo response.
• Increased exhaust temperatures.
• Poor high-RPM performance.
• Increased load on the turbocharged exhaust system.
• Engine-management faults.
• Reduced emissions-control effectiveness.

Replacing a damaged or restrictive catalyst restores a clear exhaust path and proper catalytic function.

The Fabspeed XperTune Performance Software is a custom ECU calibration developed for the Porsche 996 GT2 3.6L, 2001–2005. Designed to optimise the factory engine-management strategy, the software recalibrates key parameters such as fuelling, sensor inputs and boost control to improve horsepower, torque, throttle response and overall drivability.

Fits:

• Porsche 996 GT2 2001-05

Rather than requiring the vehicle's ECU to be removed and sent away for bench flashing, the XperTune system uses a supplied handheld programming device connected through the vehicle's OBD-II port. The original ECU data is read from the vehicle and used by Fabspeed to create a calibration matched to the vehicle's specification and modifications.

Fabspeed publishes output figures of 505 hp and 502 lb-ft compared with its quoted stock figures of 450 hp and 457 lb-ft, representing claimed gains of approximately 55 hp and 45 lb-ft. Actual results can vary according to vehicle condition, fuel quality, modifications and operating conditions.

What This Product Does:

• Reprograms the engine ECU with a performance-oriented calibration.
• Optimises engine-management parameters for increased performance.
• Adjusts fuelling strategies to suit the engine and vehicle specification.
• Optimises boost-pressure control where applicable.
• Improves throttle response and engine drivability.
• Supports increased horsepower and torque.
• Allows the calibration to be tailored to existing vehicle modifications.
• Removes the need to physically remove and ship the ECU for tuning.
• Allows the factory calibration to be restored using the supplied handheld device.
• Provides a reusable programming method for switching between the original and Fabspeed calibration on the same vehicle.

The tune is created using the original ECU file together with information about the vehicle and any installed performance modifications.

When XperTune Should Be Considered:
This software may be appropriate when:

• Additional horsepower and torque are desired.
• The vehicle remains mechanically healthy but improved performance is required.
• Performance exhaust components have been installed.
• Intake or intercooler upgrades have been fitted.
• The ECU needs to be calibrated around existing modifications.
• Improved throttle response is desired.
• The owner wants an OBD-II flashing solution without removing the ECU.
• The ability to return the vehicle to its original calibration is desirable.

The process involves:

• Reading the factory ECU data using the handheld programmer.
• Connecting the handheld device to a Windows PC.
• Supplying the original ECU data and vehicle specification to Fabspeed.
• Fabspeed creating a calibration based on the supplied vehicle information.
• Loading the custom tune onto the handheld programmer.
• Flashing the new calibration into the vehicle ECU through the OBD-II port.

The original calibration remains available so the ECU can later be returned to stock using the handheld device.

The Fabspeed RENNKRAFT Modular Headers with HJS Catalytic Converters are a high-performance exhaust manifold and catalyst upgrade developed for the Porsche 911 997.2 Carrera.

Fits:

• Porsche 997 MKII Carrera C2 3.6L 2009-12
• Porsche 997 MKII Carrera C4 3.6L 2009-12  

Fabspeed's patented RENNKRAFT modular design uses quick-release V-band connections between the headers and catalyst sections. This allows the HJS sport catalysts to be removed independently if servicing is required and enables compatible QUICKTRACK cat-bypass sections to be installed for appropriate track-only competition use.

The headers are manufactured from CNC mandrel-bent T304L stainless steel and use high-velocity merge collectors designed to improve exhaust-gas scavenging. Fabspeed states performance gains of approximately 25 hp and 20 lb-ft of torque on its development application, although actual results will vary according to vehicle condition, specification, fuel, exhaust configuration and operating conditions.

What This Product Does:

• Replaces the original exhaust manifolds and catalytic-converter sections.
• Improves the path for exhaust gases leaving the cylinder heads.
• Uses performance-oriented merge collectors to improve exhaust scavenging.
• Reduces restriction compared with the standard exhaust arrangement.
• Uses HJS 200-cell high-flow catalysts for improved gas flow.
• Helps improve throttle response and engine breathing.
• Can support increased horsepower and torque.
• Produces a sportier and more defined exhaust note.
• Enhances off-throttle burbles and higher-frequency exhaust tones.
• Retains catalytic exhaust-gas treatment when the HJS sport cats are fitted.
• Provides individually replaceable catalyst sections.
• Uses V-band connections for easier servicing and configuration changes.
• Allows compatible track-only bypass sections to be fitted without replacing the complete header assembly.
• Works with exhaust systems designed to connect to the factory-style Porsche header location.

Fabspeed states that the HJS catalyst configuration flows approximately 90–93% of an equivalent straight pipe, providing high exhaust-flow capacity while retaining a catalytic substrate.

Symptoms Of Wear Or Failure:
The original exhaust system is exposed to continuous heat cycles, vibration, moisture and corrosive exhaust gases. Over time, the manifolds, joints and catalytic converters can deteriorate.

Possible symptoms include:

• Exhaust ticking or tapping noises, especially when cold.
• Exhaust leaks around header flanges or joints.
• Soot deposits around leaking connections.
• Increased exhaust noise.
• Exhaust fumes or unusual smells around the rear of the vehicle.
• Loss of engine performance.
• Poor throttle response.
• Engine feeling restricted at higher RPM.
• Increased fuel consumption.
• Check engine warning light.
• Catalyst-efficiency fault codes.
• Rattling from inside a catalytic converter.
• Metallic noises caused by a loose catalyst substrate.
• Excessive heat around one catalytic converter.
• Failed emissions testing.
• Cracked or damaged exhaust manifolds.
• Corroded exhaust hardware or flanges.
• Damaged catalyst substrate caused by overheating or misfires.

A partially restricted catalytic converter may cause relatively normal operation at low engine speeds but increasingly restrict the engine as airflow demand rises.

Why Replacement Matters:
The exhaust headers and catalytic converters are positioned directly in the path of exhaust gases leaving the engine.

If a manifold develops a leak, exhaust gases can escape before reaching the remainder of the exhaust system. This can affect noise, emissions and engine-management readings.

If a catalytic converter becomes internally damaged or restricted, exhaust backpressure can increase. The engine then has to work harder to push exhaust gases out of the cylinders, potentially reducing performance.

Replacing worn or restrictive components can help restore:

• Efficient exhaust flow.
• Strong throttle response.
• Consistent engine performance.
• Proper catalytic-converter operation.
• Reliable exhaust sealing.
• Correct exhaust sound.
• Reduced unwanted exhaust leakage.
• More effective engine breathing.

A performance header and sport-cat system can also reduce restriction beyond the level offered by the original components.