Catalyst / Bypass

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.

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Related, superseded, cross reference or alternative numbers for comparison.

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.

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Related, superseded, cross reference or alternative numbers for comparison.

3606109918

The product you are viewing cross references to these numbers

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.

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Related, superseded, cross reference or alternative numbers for comparison.

3606109919

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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.

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Related, superseded, cross reference or alternative numbers for comparison.

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

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Related, superseded, cross reference or alternative numbers for comparison.

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   

Related reference numbers
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99711152000

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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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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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100390100392

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