Please wait… 
Please wait while we process your order,
do not press the back button… 
Design 911 Design 911 supply Porsche parts, Porsche spares and Porsche accessories, to both retail and to the trade. Our Porsche product and accessory range includes brakes, exhausts, tyres, wheels and Porsche panels and interiors. https://design91.uk/images/schemaLogo.png https://design91.uk/images/schemaLogo.png +443456003478 https://design91.uk Facebook Instagram

Exhaust Package

Filter by brand
DISPLAYING 1 to 6 (of 6 products)
EXHAUSTKIT39
Product Information
Product Information
Sports Cat Bypass + Headers Package (+15 to 20bhp)

designtek

DesignTek 996 Performance exhaust package. High Grade stainless steel exhaust system for Porsche 996 GT3
Made from 14 - 16 gauge T304 stainless steel.

Includes Sports Cat Bypass and Equal length sports headers giving your car a really feel and superb sports car sound.

*Please note Cat bypass systems may not be emissions legal in all counties 

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Related, superseded, cross reference or alternative numbers for comparison.

EXHAUSTKIT39
3606309602
99611112108

The product you are viewing cross references to these numbers
EXHAUSTKIT40
Product Information
Product Information
Sports Exhaust + Headers Package (+16 to 22bhp)

DesignTek 996 Performance exhaust package. High Grade stainless steel exhaust system for Porsche 996 GT3
Made from 14 - 16 gauge T304 stainless steel.

Includes Sports mufflers, Equal length sports headers Giving +16 to +22 bhp that you can really feel and superb sports car sound.

*Please note this system can be fitting with factory or sports after market cats

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Related, superseded, cross reference or alternative numbers for comparison.

EXHAUSTKIT40
3606309602
99622096300SGT3

The product you are viewing cross references to these numbers
EXHAUSTKIT41
Product Information
Product Information
Sports Exhaust + Headers + Cat Bypass Package (+20 to 27bhp)

DesignTek 996 Performance exhaust package. High Grade stainless steel exhaust system for Porsche 996 1998-2004.
Made from 14 - 16 gauge T304 stainless steel.

Includes Sports mufflers, Equal length sports headers and sports cats bypass pipes. Giving +20 to +27 bhp that you can really feel and superb sports car sound.

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.

EXHAUSTKIT41
3606309602
99622096300SGT3
3606209961
FITTINGKIT06

The product you are viewing cross references to these numbers
EXHAUSTKIT34
Product Information
Product Information
Sports Exhaust + 200 Cell X-Pipe Ø55mm Sports Cats Package

designtek

DesignTek 996 Stage 1 Performance package. High Grade stainless steel exhaust system for Porsche 996 1998-2004. 14 - 16 gauge T304 stainless steel.

Includes sports mufflers, 200 cell sports cats giving that you can really feel and superb sports car sound.
Fitting clamps in the images are not included

PLEASE NOTE THESE CATS MAY REQUIRE A REMAP TO ENSURE NO DASHBOARD LIGHTS - Please contact us regarding this!

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.

EXHAUSTKIT34
3606009602
3606109963
99611112257
99611113254
99611198404
99611113274
99611113275
99611113270
99611198405
99611113168
99611198504
99611113174
99611113175
99611113170
99611198505
99611112157
99611113154
99611111350
99906402601
90007428702
90008308000
90012305020
N0138322
99908405202
99711152000
99611110800
90037818301
90037810501
90038000501

The product you are viewing cross references to these numbers
FITTINGKIT02
Product Information
Product Information
Exhaust Fitting Kit. Porsche (911) 996 GT3

Fits:
Porsche 996 GT3

Kit Includes:
2 x Header Gaskets (Diagram Ref 3)
2 x Header to Cat Gaskets (Diagram Ref 7)
2 x Cats to Muffler Clamps (Diagram Ref 29)
2 x Muffler to Tail Pipe Clamps (Diagram Ref 22)

*Click on the image to see a large parts diagram.

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

FITTINGKIT02
99611110771
99611111350
99711152000
99611110800

The product you are viewing cross references to these numbers
PS071T
Product Information
Product Information
The ultimate Sports Exhaust system for the Porsche GT3 inc RS & CS
QuickSilver were approached by a well known specialist in racing and track-day Porsche, to develop a complete SUPERCUP exhaust system for enthusiast customers.

KEY FEATURES:
• More Power +20bhp
• Less Weight - to lose over 20kgs (~44lbs) from the rear of the car.
• Ease of fit & no loss of ground clearance > All in a compact volume.
• Great Sound - but to enable compliance with most track-day venues - A tall order!
• Motorsports Look.
• Appropriate Sound - about 105dB > but reduced further with removable Titanium cans.

An ambitious project, requiring new materials technology, manufacturing methods, component integration and constant testing.

The factory exhaust includes five muffler casings, 2 x Cats, 2 x side mufflers and 1 x rear muffler. QuickSilver's brief was to distil these into 1 x casing & similar to the system produced by Porsche's Motorsport Dept for their international one-make racing series.

Drawing their constant racing experience our partners were able to provide technical input and testing facilities.

Throughout the development period the system was evaluated both at our partner's in-house test facilities and on the track. Each time refinements were included in the overall design to create a fantastic system worthy of the Porsche name.

QuickSilver system includes:
• Manifolds with equal-lenght primary pipes of the appropriate bore for optimum power.
• Single rear silencer casing housing integral 200 cpsi RACE catalytic converters.
• Provision for fitting of OBD2 exhaust sensors measuring the exhaust gas composition before and after the Cats on both cylinder banks.

Brand: QUICK SILVER

Fits:
Porsche 911 (996) GT3 1998-05
DISPLAYING 1 to 6 (of 6 products)
Also found on these pages
About Exhaust Package

Exhaust System Packages for Porsche | Performance, Precision & Sound

A well-designed exhaust system package is essential for maintaining your Porsche’s performance, efficiency, and distinctive exhaust tone. These complete systems replace worn or restrictive exhaust components with precision-engineered, high-flow assemblies that restore or enhance power delivery and sound quality.

At Design911, we offer a comprehensive selection of exhaust system packages for Porsche models — from classic 911s to modern GT-series vehicles. Each package includes key components such as silencers, manifolds, catalytic converters, and pipework, designed for optimal gas flow, reduced back pressure, and improved throttle response.

Manufactured from premium stainless steel, Inconel, or titanium, our exhaust kits are built for durability, corrosion resistance, and superior acoustic performance. Whether you’re restoring a vintage air-cooled model or tuning your track-ready GT3, these exhaust systems deliver a perfect balance of reliability, performance, and sound.

What Do Exhaust System Packages Do?

An exhaust system package channels exhaust gases away from the engine efficiently while controlling noise and emissions. A properly designed system ensures optimal engine breathing — improving power, torque, and overall efficiency.

Core Functions:

  • Directs exhaust gases safely from the engine.
  • Reduces back pressure to maximise power output.
  • Controls emissions via catalytic converters and mufflers.
  • Enhances exhaust tone for an authentic Porsche sound.
  • Optimises gas flow for performance and reliability.

An upgraded exhaust system can also provide weight reduction, improved throttle response, and enhanced driving enjoyment.

Why Do Exhaust Systems Fail?

Over time, even the most durable exhaust systems deteriorate due to constant exposure to heat, vibration, and the elements.

Common Causes of Exhaust System Failure Include:
Corrosion and rust, especially on mild steel systems.

  • Cracks or leaks caused by vibration and thermal stress.
  • Worn gaskets or clamps leading to exhaust leaks.
  • Clogged catalytic converters reducing flow and performance.
  • Broken hangers or mounts causing misalignment.

When exhaust components fail, you may notice rattling sounds, loss of performance, strong fumes, or increased fuel consumption — all signs that replacement is needed.

Why Replace or Upgrade Your Exhaust System?

Replacing or upgrading your Porsche’s exhaust system ensures maximum performance, efficiency, and driving enjoyment.

Key Benefits:

  • Restores optimal gas flow and back pressure.
  • Improves horsepower and torque.
  • Enhances sound and throttle response.
  • Reduces weight for improved handling.
  • Prevents leaks and emissions issues.
  • Crafted from corrosion-resistant, high-grade materials.
  • Direct-fit design for Porsche 911, Cayman, Boxster, Panamera, Macan and more.

Whether for performance tuning, restoration, or replacement, Design911’s exhaust system packages deliver the sound, precision, and reliability Porsche owners expect.

Highlights:

  • Complete exhaust system packages for all Porsche models.
  • Includes manifolds, silencers, catalytic converters, and pipes.
  • Manufactured from stainless steel, Inconel, or titanium.
  • Engineered for maximum performance and sound.
  • Precision-fit designs for simple installation.
  • Ideal for performance upgrades or restorations.

You may also like
Popular Models