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Porsche > 997 (911) MK2 2009-2012 > 997 MKII Carrera C4 3.6L 2009-12 > Exhausts >

Catalyst / Bypass

Catalyst / Bypass

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DISPLAYING 1 to 7 (of 7 products)
Sports Exhaust Switchable & Bypass Pipe Package (adds25 to 30 bhp) Porsche 997 GEN2 C2 / C4 / C4S - 3606009719, 3606009717, 99711111330, 99711122030, 90091000303, N01024426
1
Sports Exhaust Switchable & Bypass Pipe Package (adds25 to 30 bhp) Porsche 997 GEN2 C2 / C4 / C4S
EXHAUSTKIT23
Product Information
Product Information
Sports Exhaust VALVETROINC + X-Pipe Design Sports Cat bypass Package

designtek

DesignTek Valvetronic sports exhaust system gives smooth high torque feel to the wheels with the valves opened, +8HP/10 ft-lbs of torque to the wheels with the valves closed. Made from high quality 14-16 gauge T304 stainless steel, hydro-formed muffler cases, radiuses stressed relieved with 2000 degree ceramic fiber and stainless steel wool packed free flow mufflers.

Valvetronic
High-Performance Rear Exhaust with sound switch:
● Push the sound-button between:
Switch closed: Deep Sports Turbo Sound

Switch opened: Perfect Racing Sports Sound

DesignTek X-Pipe (primary muffler bypass) deletes the stock primary muffler and saves 6.4 lbs. from the rear of the vehicle. With a fast air flow the X-pipe increases BHP and Toque.

Made from high quality T304 14-16 gauge stainless steel, C.N.C. mandrel bent. The X-Pipe (primary muffler bypass) gives a great exotic car sound and power by about 5 decibels.

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Related, superseded, cross reference or alternative numbers for comparison.

EXHAUSTKIT23
3606009719
3606009717
99711111330
99711122030
90091000303
N01024426

The product you are viewing cross references to these numbers
AWE Performance exhaust cross over pipes for Porsche 997.2 Carrera / S - 3010-11010, 3010
2
AWE Performance exhaust cross over pipes for Porsche 997.2 Carrera / S
3010-11010
Product Information
Product Information
AWE Performance exhaust cross over pipes.

awe

Fits:
Porsche 997.2 (911) Carrera / S 3.6L - 3.8L

• Power Enhancement Bolt On
• P6.5lbs weight savings
• P5hp and 5 lb ft increase
• P100% T304 Stainless Steel Construction
• PPerfect Fitment - Guaranteed

For 2009-> 997.2 owners looking to eliminate the rear muffler, we offer Cross Over Pipe sections ...

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Related, superseded, cross reference or alternative numbers for comparison.

3010-11010
3010-11010
3010

The product you are viewing cross references to these numbers
Exhaust manifold with 200 cell catalytic converter. Porsche 997.2 - 99711310932, 997113109AX, 99711311032, 997113110AX
4
Exhaust manifold with 200 cell catalytic converter. Porsche 997.2
3606109978/1
Product Information
Product Information
Exhaust manifold with 200 cell catalytic converter. Porsche 997.2


designtek

Fits:
Porsche 997.2 Carrera 2009-12

Made out of 304 grade stainless steel. You may need lambda extensions if your car has engine check light on after installation.

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.



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

3606109978
99711310932
997113109AX
99711311032
997113110AX

The product you are viewing cross references to these numbers
Exhaust manifold with cat bypass (with catalyst chamber). Porsche 997.2 - 99711310932, 997113109AX, 99711311032, 997113110AX
4
Exhaust manifold with cat bypass (with catalyst chamber). Porsche 997.2
3606109975
Product Information
Product Information
Exhaust manifold with cat bypass. These headers are offroad use only. 
These manifolds have an empty chamber that gives an impression you have catalytic converters on the car.


designtek

Fits:
Porsche 997.2 Carrera 2009-12

Made out of 304 grade stainless steel and would provide gains of 15 BHP. Remapping of the car after fitment is highly recomended.

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.



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

3606109975
99711310932
997113109AX
99711311032
997113110AX

The product you are viewing cross references to these numbers
Exhaust manifold with cat bypass. Porsche 997.2 - 99711310932, 997113109AX, 99711311032, 997113110AX
4
Exhaust manifold with cat bypass. Porsche 997.2
3606109978
Product Information
Product Information
Exhaust manifold with cat bypass. These headers are offroad use only.

designtek

Fits:
Porsche 997.2 Carrera 2009-12

Made out of 304 grade stainless steel and would provide gains of 15 BHP. Remapping of the car after fitment is highly recomended.

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.

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

3606109978
99711310932
997113109AX
99711311032
997113110AX

The product you are viewing cross references to these numbers
Lambda Sensor Blanking Plug and Receiver Socket. Porsche 996 / 997 - 100390, 100392
3
Lambda Sensor Blanking Plug and Receiver Socket. Porsche 996 / 997
100390100392
Product Information
Product Information
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.

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

100390100392
100390
100392

The product you are viewing cross references to these numbers
Sports Exhaust System Valved. Porsche 997.2 - 99711199631, 99711131231, 99711113230, 99711113231, 99711131130, 99711199531, 99711131131, 99711113131, 99711113130 - 9M9972NA
5
Sports Exhaust System Valved. Porsche 997.2
9M9972NA
Product Information
Product Information

Ninemeister 9m Valved Sports Exhaust System 

Transform the sound of your Porsche 997.2 Carrera with the Ninemeister 9m Valved Sports Exhaust System, combining a T304 stainless steel cat-back design, X-pipe centre bypass and remote-controlled valves to give you greater control over your Porsche's exhaust note.

Fits:

  • Porsche 997 MKII Carrera C2 3.6L 2009-12
  • Porsche 997 MKII Carrera C4 3.6L 2009-12
  • Porsche 997 MKII Carrera C2S 3.8L 2009-12
  • Porsche 997 MKII Carrera C4S 3.8L 2009-12

Designed for Porsche 997.2 Carrera 3.6L and 3.8L models from 2009 to 2012, the 9m system delivers the flexibility of a crisp, engaging sports exhaust note when you want it, with the option of a more subtle and refined tone when required.

Remote-Controlled Valved Exhaust

At the heart of the Ninemeister 9m system is its remote-controlled valve configuration, allowing the character of the exhaust to be changed depending on the journey.

With the valves open, the system delivers a crisper and more pronounced sports exhaust note, allowing the character of the flat-six engine to take centre stage.

Close the valves and the system provides a quieter, more subtle exhaust tone suited to longer journeys, motorway driving or situations where a more discreet sound is preferred.

T304 Stainless Steel Construction

The Ninemeister 9m exhaust is manufactured from T304 stainless steel, providing a high-quality and durable construction suitable for a performance exhaust application.

The cat-back configuration incorporates an X-pipe centre bypass, creating a purposeful exhaust layout specifically designed for the Porsche 997.2 Carrera.

X-Pipe Centre Silencer Bypass

The X-pipe centre bypass forms an integral part of the 9m exhaust system, creating a performance-focused layout for the 997.2 Carrera.

Combined with the valved rear exhaust configuration, it provides a more engaging exhaust character while retaining the ability to switch to a quieter setting when desired.

3.5-Inch Quad Exhaust Tips

The system is completed with four substantial 3.5-inch exhaust tips, giving the rear of the Porsche 997.2 Carrera a more purposeful appearance.

Customers can choose between Black or Silver tip finishes, allowing the exhaust to complement the individual specification and exterior detailing of the car.

Professional installation by an experienced Porsche specialist is recommended to ensure correct fitment and operation of the valved system.

Sports Sound When You Want It

The key advantage of the Ninemeister 9m valved exhaust is its versatility. Rather than committing to a permanently louder sports exhaust, the remote-controlled valves allow the driver to select the character that best suits the journey.

Open the valves for a crisp, sporting flat-six soundtrack or close them for a quieter and more discreet exhaust tone.

Why Choose the Ninemeister 9m Valved Exhaust?

For Porsche 997.2 Carrera owners looking for a valved sports exhaust, the Ninemeister 9m combines premium stainless steel construction with switchable sound and purposeful quad-tailpipe styling.

Key advantages include:

  • Switchable sports exhaust character
  • Remote-controlled valves
  • T304 stainless steel construction
  • X-pipe centre bypass
  • Designed for 3.6L and 3.8L 997.2 Carrera models
  • Quad 3.5-inch tailpipes
  • Black or Silver tip options
  • Sporting sound with valves open
  • Refined tone with valves closed       



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

9M9972NA
99711199631
99711131231
99711113230
99711113231
99711131130
99711199531
99711131131
99711113131
99711113130

The product you are viewing cross references to these numbers
DISPLAYING 1 to 7 (of 7 products)
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About Catalyst / Bypass

Exhaust Catalytic Converters & Bypass Pipes – Performance, Efficiency & Flow Control

The catalytic converter plays a crucial role in your Porsche’s exhaust system, reducing harmful emissions while maintaining optimal exhaust flow. Positioned between the exhaust manifold and silencer, it converts toxic gases such as carbon monoxide, hydrocarbons, and nitrogen oxides into less harmful emissions before they exit the tailpipe.

At Design911, we offer a complete range of catalytic converters and bypass pipes for Porsche vehicles. Our manufacturer-quality converters ensure reliable emission control and long-term performance, while our bypass options are designed for track or performance use, optimising exhaust flow for maximum power and throttle response.

Whether you’re maintaining your Porsche to meet emissions standards or upgrading for improved exhaust performance, our selection includes both direct-fit converters and performance bypass kits built from high-grade stainless steel for strength, corrosion resistance, and durability.

What Do Catalytic Converters & Bypass Pipes Do?

A catalytic converter uses a fine mesh of precious metals to trigger chemical reactions that break down pollutants. The bypass alternative eliminates restriction in the exhaust flow, improving performance in non-emissions-controlled environments such as track driving.

Core Functions:

  • Converts toxic exhaust gases into environmentally friendly emissions.
  • Maintains exhaust back pressure for engine efficiency.
  • Reduces harmful NOx, CO, and HC emissions.
  • Supports smoother engine performance and throttle control.
  • Bypass versions enhance exhaust flow and improve power output for track cars.

Upgrading to a performance-grade system ensures your Porsche continues to meet emission requirements — or achieves greater flow and responsiveness for motorsport applications.

Why Do Catalytic Converters Fail?

Catalytic converters are exposed to extreme heat, unburnt fuel, and contaminants — all of which can degrade their performance over time.

Common Causes of Failure Include:

  • Carbon or oil buildup blocking the internal honeycomb.
  • Thermal damage from overheating or rich fuel mixtures.
  • Physical damage from road debris or misfiring engines.
  • Corrosion due to moisture and exhaust condensation.
  • Age-related wear reducing catalytic efficiency.

A failing converter can cause reduced engine power, poor fuel economy, rattling sounds, or a check-engine light. Replacing it restores emissions compliance, performance, and exhaust efficiency.

Why Replace or Upgrade with Precision-Engineered Components?

Replacing a failing converter or upgrading to a bypass pipe ensures your Porsche maintains peak performance and reliability.

Key Benefits:

  • Restores optimal emissions performance and efficiency.
  • Improves exhaust flow and throttle response.
  • Reduces engine stress and fuel consumption.
  • Durable stainless-steel construction for longevity.
  • Direct-fit compatibility for Porsche 911, Cayman, Boxster, Panamera, Macan and more.
  • Performance bypass options available for track and tuning applications.

Whether you want emissions compliance or maximum flow for competition use, our parts deliver reliability, precision, and performance.

Highlights:

  • Direct-fit catalytic converters and bypass pipes for Porsche models.
  • Precision-engineered for optimal flow and reduced emissions.
  • Built from heat-resistant stainless steel for durability.
  • Bypass pipes for performance tuning and track applications.
  • Restores power, efficiency, and exhaust sound balance.
  • Available for classic and modern Porsche vehicles.

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