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- 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
DesignTek sports exhaust system. 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.
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.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
EXHAUSTKIT38
The product you are viewing cross references to these numbers
This kit is comprised of the following items:
- 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

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
The product you are viewing cross references to these numbers
This kit is comprised of the following items:
- 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

The typical Porsche sound - powerful, robust, sporty. Better still, it can be further enhanced using this sports exhaust system. The sound varies with driving behavior, ranging from a robust out put during normal road driving to a distinctively more aggressive tone during performance use.
The mode of the sports exhaust system is selected using a button in the centre console, if this button is not already pre-fitted in your car you will need to order this with us by providing the chassis / VIN number when ordering.
The package includes:
- Tailpipes made of die cast aluminum.
- Two rear mufflers
- One Centre Muffler
- Exhaust straps clamps and wiring
Fits:
Porsche 997 MKII Carrera
Porsche 997 MKII Carrera S
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99704420004
The product you are viewing cross references to these numbers
- 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

This is the switch required for the original Porsche sport exhaust system our part number code 99994420004
Please check your vehicle options
I030 -SPORT TYPE CHASSIS
I176 -SPORT EXHAUST (which you would be fitting)
I475 -PASM ELECTRONIC DAMPER CONTROL
I476 -PORSCHE STABILITY MANAGEMENT PSM
Fits:
Porsche 997 MKII Carrera 2009-2011
Porsche 997 MKII Carrera S 2009-2011
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99761355301A05
The product you are viewing cross references to these numbers
- 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

This is the switch required for the original Porsche sport exhaust system our part number code 99994420004
Please check your vehicle options
I030 -SPORT TYPE CHASSIS
I176 -SPORT EXHAUST (which you would be fitting)
I250 -PDK TRASMISSION
I475 -PASM ELECTRONIC DAMPER CONTROL
I476 -PORSCHE STABILITY MANAGEMENT PSM
I639 -SPORT CHRONO PACKAGE
I640 -SPORT CHRONO PACKAGE PLUS
Fits:
Porsche 997 MKII Carrera
Porsche 997 MKII Carrera S
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99761356301A05
The product you are viewing cross references to these numbers
Porsche Performance Exhaust Packages - Power, Sound & Flow Upgrades
Exhaust Packages are complete performance exhaust solutions designed to improve exhaust gas flow, enhance engine efficiency, and transform the sound of your Porsche. By upgrading restrictive factory components with high-flow systems, exhaust packages help reduce backpressure, improve throttle response, and unlock additional performance—especially in tuned or performance-driven engines.
Available from Design911, Porsche exhaust packages combine precision-engineered components such as headers, sports catalysts, silencers, and tailpipes to deliver a balanced upgrade in power, sound, and durability.
What Do Exhaust Packages Do?
Exhaust packages manage the efficient removal of exhaust gases from the engine.
Core Functions:
- Reduce exhaust backpressure for improved engine breathing.
- Enhance power delivery and throttle response.
- Improve exhaust sound and tone.
- Optimise exhaust flow across the RPM range.
- Support tuning and performance modifications.
Efficient exhaust flow is essential for maximising engine performance and responsiveness.
Why Do Standard Exhaust Systems Fail?
Factory exhaust systems are designed for noise control,
emissions, and cost, which can lead to performance and durability limitations.
Common issues include:
- Restrictive pipework limiting airflow.
- Internal corrosion from heat and moisture.
- Catalyst degradation over time.
- Excessive weight reducing performance efficiency.
- Incompatibility with performance tuning upgrades.
Failing exhaust components can cause power loss, rattles, leaks, and reduced engine efficiency.
Why Upgrade to a Performance Exhaust Package?
Performance exhaust packages are engineered to improve flow, sound, and reliability.
Upgrade Benefits:
- Increased power and improved throttle response.
- Reduced system weight for better performance.
- Enhanced exhaust sound without excessive drone.
- Improved durability using stainless steel or motorsport materials.
- Ideal foundation for further engine tuning.
Upgrading the exhaust system unlocks performance potential while enhancing driving enjoyment.
Highlights
- Porsche performance exhaust package upgrades
- Improved exhaust flow and power delivery
- Enhanced sound quality and tone
- Designed for tuned and performance engines
- High-quality materials for long-term durability