Catalyst / Bypass

The next step from Akrapovič for the Porsche 911 Turbo / Turbo S is the optional titanium link pipe set without cats, perfectly finished with a coating to offer greater durability without altering the look. Designed to create the best exhaust flow and offering a huge weight saving over stock—when used in conjunction with the Slip-On—the link pipes increase power and give the car a sporty racing sound. Enhancing the tuning opportunities of this superb car, the link pipes without cats are an easy-to-install performance upgrade.

Fits:
Porsche 991 (911) Turbo/Turbo S 2014>>

TECHNICAL DATA
** measured with: Porsche 911 Turbo/Turbo S (991) 2014

Maximum power:
- kW: plus 7.1 / 5400 rpm
- HP (m): plus 9.7 / 5400 rpm
- HP (i): plus 9.6 / 5400 rpm

Maximum torque:
- Nm: plus 50.0 / 2300 rpm
- lb-ft: plus 36.9 / 2300 rpm

Weight:
- minus 5.6 kg / 12.4 lb

Please note: When installing Akrapovič aftermarket optional link pipes without catalytic converters, which are developed for use on closed tracks only, remapping the ECU is mandatory. Akrapovic Delete-R will not eliminate possible engine check errors codes caused by increasing emissions flow.

NOTE: 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 in the United Kingdom. They are not MOT compliant and must not be used on public roads. These components are intended for race and track use only. If you are located outside the UK, please consult your local laws and regulations to ensure compliance.

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L-PO991T

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A Voucher for £100 available when you buy this product. For more information CLICK HERE

DesignTek Exhaust manifold / header with 200 Cell Euro 4 coating substrate.
Price is for PAIR.

Fits:
Porsche 991.1 Carrera / S

NOTE: 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 in the United Kingdom. They are not MOT compliant and must not be used on public roads. These components are intended for race and track use only. If you are located outside the UK, please consult your local laws and regulations to ensure compliance.

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3606109915

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A Voucher for £100 available when you buy this product. For more information CLICK HERE

DesignTek Exhaust manifold / header with catalyst bypass.
Price is for PAIR.

Fits:
Porsche 991.1 Carrera / S

NOTE: 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 in the United Kingdom. They are not MOT compliant and must not be used on public roads. These components are intended for race and track use only. If you are located outside the UK, please consult your local laws and regulations to ensure compliance.

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3606109918

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A Voucher for £100 available when you buy this product. For more information CLICK HERE

DesignTek Exhaust manifold / header with catalyst bypass.
Price is for PAIR.

Fits:
Porsche 991.1 Carrera 3.4L 2012-2015
Porsche 991.1 Carrera S 3.8L 2012-2015

NOTE: 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 in the United Kingdom. They are not MOT compliant and must not be used on public roads. These components are intended for race and track use only. If you are located outside the UK, please consult your local laws and regulations to ensure compliance.

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3606109919

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Exhaust cat bypass pipes with gaskets.

Fits:
Porsche 991.1 Turbo / Turbo S

Porsche 991.2 Turbo / Turbo S

Free-flowing straight pipes replace the bulky & restrictive factory catalytic converters; designed specifically for maximum flow during racing or competition.

FEATURES:
• Maximizes power and throttle response while decreasing back pressure.
• Completely removes the catalytic converters for maximum exhaust flow and performance.
• Constructed from high-quality stainless steel for optimum flow and maximum durability.
• Direct replacement bolt-on for stock cat or Sport Cats

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.

NOTE: 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 in the United Kingdom. They are not MOT compliant and must not be used on public roads. These components are intended for race and track use only. If you are located outside the UK, please consult your local laws and regulations to ensure compliance.

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3606109916

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Fabspeed Exhaust Cat bypass Pipes.

Increase exhaust flow from the headers to the mufflers and improving power and sound by removing the bulky and restrictive factory catalytic converter.

FEATURES:
• Fits all 991 Turbo vehicles (2013+)
• Fabspeed's Cat bypass Pipes replace the restrictive factory catalytic converters with much less restrictive straight-through pipes for maximum flow and performance
• Noticeable increase in power and improved throttle response
• Saves 10 lbs in the rear of the vehicle versus the bulky factory catalytic converters
• Adds aggressive exhaust note for high performance sound
• Constructed from high-quality 14-16 gauge C.N.C. mandrel-bent T304L stainless steel for optimum flow and maximum durability
• Direct bolt-on replacement
• 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.

NOTE: 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 in the United Kingdom. They are not MOT compliant and must not be used on public roads. These components are intended for race and track use only. If you are located outside the UK, please consult your local laws and regulations to ensure compliance.

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FSPOR991TCB

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Fabspeed Exhaust Catback Competition Race X-Pipe. 

The ultimate lightweight cat-back exhaust system for the 991 GT3 / GT3 RS saves 54lbs (24kg) off the rear of the vehicle and is perfect for competitive track use, high performance drivers education events, or aggressive street sound.

FEATURES:
• Fits all Porsche 991 GT3 / GT3 RS models (2014-2016)
• Perfect exhaust solution for maximum performance and sound during competitive track use, high performance drivers education events, or simply achieving an aggressive and exciting street sound.
•   Saves over 54lbs (24kg) from the rear of the 991 GT3 which improves handling and acceleration by replacing the bulky factory center muffler and side mufflers
•   Engineered and manufactured with 3" (76mm) T304L stainless steel tubing with integral tuned center X-Pipe to 70mm outlets.
•   Bolt-on installation' no cutting or welding required
•   Includes two (2) 90 degree Turndown Tips for track use.
•   All Fabspeed performance products are backed by Fabspeed's Lifetime Warranty

NOTE: This is a straight pipe, racing oriented exhaust system built to be light and make power. As a result, the volume level will be very high inside the vehicle. 



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Exhaust Muffler / Sport Switchable Race Exhaust System in Titanium DesignTek. With Cat bypass pipes.

High quality titanium exhaust system for the Porsche 991.1. Manifold back exhaust that includes Catalytic converter bypass and tailpipes.

The silencers in this exhaust are linked to one another, creating a greater balance between the two silencers which improves flow, performance and provides a sports sound. It is a performance exhaust with a louder note and boasts significant power gains over OE system. This is race / offroad use only.

Exhaust sleeve catalytic converter to silencer.
Connecting sleeve from cat to rear silencer.
Price is for each sleeve.

Fits:
Porsche 996 1998-05 (not Turbo and GT2)

Porsche 997 2005>> (not Turbo and GT2)

Porsche 991 Carrera C2 3.4L (350Bhp)
Porsche 991 Carrera C2S 3.8L (400Bhp)
Porsche 991 Carrera C4 3.4L (350Bhp)
Porsche 991 Carrera C4S 3.8L (400Bhp)
Fits cars with and without sport exhaust

Click 'Zoom in' for large parts diagram.
Diagram ref no 13

This high-quality exhaust connecting sleeve joins the catalytic converter to the rear silencer on Porsche 996 and 997 models, offering a superior solution compared to the original Porsche part and many aftermarket alternatives.

Manufactured to tighter tolerances and improved material quality, this upgraded exhaust sleeve provides a more precise fit, improved sealing, and enhanced durability over time. Unlike the original OE sleeve – which can be prone to corrosion and fitment issues as the vehicle ages – this version is designed to deliver long-term reliability and ease of installation.

Crucially, this sleeve is engineered to fit both Porsche 996 and Porsche 997 applications, making it a more versatile and cost-effective option than other aftermarket versions that are often model-specific or require modification.

Direct replacement for Porsche part number 99711152000

Fits Porsche 996 and Porsche 997 models

Improved fit and sealing versus the original OE sleeve

Higher quality construction than typical aftermarket alternatives

Reduces the risk of exhaust leaks and future corrosion

Ideal for exhaust repairs, restorations, or upgrades

Price is per individual sleeve

Whether you are refreshing a tired exhaust system or carrying out a full overhaul, this exhaust sleeve offers a better-than-OEM solution trusted by Porsche specialists and enthusiasts alike.

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99711152000

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Exhaust sleeve catalytic converter to silencer.
Price is for each sleeve.



Original Porsche connecting sleeve from cat to rear silencer.

Fits:
Porsche 997 2005>> (not Turbo and GT2)
    Fits cars with and without sport exhaust

Porsche 991 Carrera C2 3.4L (350Bhp)
Porsche 991 Carrera C2S 3.8L (400Bhp)
Porsche 991 Carrera C4 3.4L (350Bhp)
Porsche 991 Carrera C4S 3.8L (400Bhp)

Click 'Zoom in' for large parts diagram.
Diagram ref no 13

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99711152000

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Titanium (grade 5) Exhaust sleeve catalytic converter to silencer.
Connecting sleeve from cat to rear silencer. Price is for each sleeve.

Fits:
Porsche 996 1998-05 (not Turbo and GT2)
Porsche 997 2005>> (not Turbo and GT2)
Porsche 991 Carrera C2 3.4L (350Bhp)
Porsche 991 Carrera C2S 3.8L (400Bhp)
Porsche 991 Carrera C4 3.4L (350Bhp)
Porsche 991 Carrera C4S 3.8L (400Bhp)

Fits cars with and without sport exhaust
Grade 5 titanium is resistant to salt water and variety of corrosive media temperatures below 300°C

Click 'Zoom in' for large parts diagram.
Diagram ref no 13

Titanium Exhaust Sleeve – Catalytic Converter to Rear Silencer Grade 5 Titanium (Ti-6Al-4V) Porsche 996 / 997 / 991 

Replaces Porsche Part Number: 99711152000 

This Grade 5 titanium exhaust sleeve connects the catalytic converter to the rear silencer and represents a significant upgrade over the original Porsche steel sleeve and conventional aftermarket alternatives. Manufactured from aerospace-grade Grade 5 titanium (Ti-6Al-4V), this Rohler exhaust sleeve delivers exceptional strength, corrosion resistance, and weight reduction, making it the ideal long-term solution for performance-focused and enthusiast-owned Porsches. Unlike the original OE clamp, which is susceptible to corrosion over time, this titanium version is highly resistant to salt water and corrosive environments at temperatures below 300°C, ensuring outstanding longevity. 

Precision-engineered for accurate fitment across multiple Porsche generations, this upgraded sleeve fits 996, 997, and select 991 Carrera models, offering broader compatibility than many aftermarket options while retaining true bolt-on installation. 

Grade 5 titanium (Ti-6Al-4V) construction 

Stronger, lighter, and more corrosion-resistant than OEM steel sleeves 

Superior longevity compared to original and aftermarket versions 

Direct replacement for Porsche 99711152000 

Precision fit with excellent sealing Suitable for standard and factory sport exhaust systems 

Ideal for performance, restoration, or preventative maintenance   

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Fabspeed Exhaust Sport Catalytic Converters.

High-flowing, direct bolt-on replacement for the bulky & restrictive factory catalytic converters.

FEATURES:
• Fits all 991 Turbo vehicles (2013+)
• Improves power and throttle response while decreasing back pressure
• High flow sport race cat for maximum flow and power.
• Constructed from high-quality 14-16 gauge T304L stainless steel for optimum flow and maximum durability
• Includes integrated O2 sensor bung for fuel-injected cars
• Direct replacement bolt-on for stock cat or cat bypass pipe

NOTE: Fabspeed's 200-cell high-flow catalytic converters are not C.A.R.B. certified and are for Off-Road Use ONLY in the state of California

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.

NOTE: 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 in the United Kingdom. They are not MOT compliant and must not be used on public roads. These components are intended for race and track use only. If you are located outside the UK, please consult your local laws and regulations to ensure compliance.

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FSPOR991TSC

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Fabspeed RENNKRAFT Modular Headers With HJS Catalytic Converters.

The Fabspeed Porsche 991 Carrera RENNKRAFT Modular Headers with HJS Catalytic Converters are a high-performance exhaust manifold and sport-catalyst upgrade developed for Porsche 991 Carrera models from 2012–2016.

Fits:

• Porsche 991.1 Carrera C2 3.4L (350 Bhp) 2012-16
• Porsche 991.1 Carrera C4 3.4L (350 Bhp) 2012-16  

Fabspeed’s patented RENNKRAFT® modular design combines performance headers with removable catalyst sections connected by quick-release V-band clamps. In the road-oriented configuration, the system uses German HJS HD tri-metallic 200-cell catalytic converters to provide high exhaust flow while retaining catalytic exhaust treatment.

The headers are manufactured from CNC mandrel-bent T304L stainless steel and incorporate F1-style high-velocity merge collectors intended to improve exhaust scavenging. Fabspeed states that the system was developed from 3D scans of the original Porsche headers to achieve accurate bolt-on fitment.

For a mechanically healthy Porsche, this system is primarily a performance, exhaust-flow and sound upgrade rather than a maintenance replacement.

What This Product Does:

• The exhaust headers collect gases leaving each cylinder and route them toward the catalytic converters and the rest of the exhaust system.
• The factory headers must balance manufacturing cost, packaging, emissions performance, noise control and exhaust flow. The Fabspeed RENNKRAFT system is designed to provide a less restrictive route while improving the way exhaust pulses merge.
• Fabspeed states that the system provides +25 horsepower and +20 lb-ft of torque. These are Fabspeed-published figures from its testing and actual gains may vary according to vehicle condition, fuel, ambient conditions and the remainder of the exhaust system.
• The header system is designed to improve exhaust flow, enhance scavenging, produce a more aggressive exhaust note and create a modular platform that allows catalyst sections to be serviced or changed independently.

Symptoms Of Wear Or Failure:

• Factory exhaust headers are exposed to extremely high temperatures and repeated heating and cooling cycles.
• Possible signs of deterioration include exhaust ticking when cold, blowing or hissing noises, visible cracks, damaged welds, loose flange hardware, black soot around leaking joints, unusual exhaust smells, metallic rattling, increased engine-bay exhaust noise or reduced performance caused by leakage or restriction.
• Leaks often become more noticeable during cold start because gaps can change as the exhaust system reaches operating temperature.
• Catalytic converters can deteriorate through mileage, excessive heat, contamination or underlying engine problems.
• Potential symptoms include a Check Engine Light, catalyst-efficiency fault codes, reduced high-RPM performance, sluggish acceleration, excessive exhaust heat, metallic rattling from inside the catalyst, unusual exhaust smells or a feeling that the engine is unable to breathe freely at higher loads.
• A physically damaged catalyst substrate can break apart or melt, potentially creating exhaust restriction.

Why Replacement Matters:

• A leaking or cracked exhaust header can allow hot exhaust gases to escape before they reach the remainder of the exhaust system.
• This can lead to increased noise, inaccurate oxygen-sensor readings, reduced engine performance and unnecessary heat around nearby components.
• A blocked or damaged catalytic converter can create excessive exhaust restriction. On a naturally aspirated engine such as the 991.1 Carrera, restriction can reduce the engine’s ability to evacuate exhaust gases efficiently and may result in reduced power, poor high-RPM response and increased exhaust temperatures.
• Replacing worn or failed components restores a sealed and properly flowing exhaust path.
• If the original components are still healthy, however, fitting the Fabspeed RENNKRAFT system is mainly a performance and sound upgrade.

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.

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FSPOR991MHSC

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Headers with 300 Cell Race Cats

High quality T304 Stainless steel equal length primary tubes. C.N.C. mandrel bent.

Designed for maximum flow and no restriction.

Reduced back pressure and better scavenging. More torque and horsepower across the RPM band.

Fits:
Porsche 991 GT3 3.8L 476 Bhp 2013 - 2017 (A175 engine)
Porsche 991 GT3 RS 4.0L 507 Bhp 2013 - 2017 (A175 engine)
Porsche 911 R 4.0L 507Bhp 2014-2017 (A176 engine)

Please note: This will not fit cars:
- with engine codes DNSA / DNSB - 4.0L with 520 Bhp
- released after 06/2017 with engine codes DGG / DGGA / DGGB

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

NOTE: 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 in the United Kingdom. They are not MOT compliant and must not be used on public roads. These components are intended for race and track use only. If you are located outside the UK, please consult your local laws and regulations to ensure compliance.

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3606309105

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Headers with Race Cat bypass

High quality T304 Stainless steel equal length primary tubes. C.N.C. mandrel bent.

Designed for maximum flow and no restriction.

Reduced back pressure and better scavenging. More torque and horsepower across the RPM band.

Fits:
Porsche 991.2 GT3 4.0L 500 Bhp 2017-2020 (DGG / DGGA engine)
Porsche 991.2 GT3 RS 4.0L 520 Bhp 2017 - 2020 (DGGB engine)

Please note: This will not fit cars:
- with engine codes DNSA / DNSB - 4.0L with 520 Bhp

Please note: These race cats will make your car sound significantly louder than with stock cats. Race track and off road use only.
We recommend to use one sport exhaust component if you are concerned about decibel levels.

NOTE: 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 in the United Kingdom. They are not MOT compliant and must not be used on public roads. These components are intended for race and track use only. If you are located outside the UK, please consult your local laws and regulations to ensure compliance.

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

Fits:
Many Porsche vehicles. Universal kit.

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