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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

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DISPLAYING 1 to 5 (of 5 products)
EXHAUSTKIT23
Product Information
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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Related, superseded, cross reference or alternative numbers for comparison.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
Special Order item
99704420004
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Product Information
Original Porsche "Switchable" Valve Sports Exhaust System

porsche

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
99704420004

The product you are viewing cross references to these numbers
3606009717
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Product Information
Exhaust Muffler / Silencer Sports VALVETRONIC V2.0

Cars with sports exhaust will need to change the tail pipe. See the recommended tailpipe.

designtek

Fits:
Porsche 997 MKII

DesignTek Valvetronic sports exhaust system gives smooth 16Bhp/18 ft-lbs of torque to the wheels with the valves opened, +9HP/11 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.

This unique exhaust configures a dual-tone setup controlled by a key fob which you can switch on the fly. Direct replacement for the factory mufflers and will work with the stock primary pipe and cats or DesignTek primary bypass pipe.

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

Switch opened: Perfect Racing Sports Sound

Superb sports car sound, throaty and deep with the valves opened, but docile with the valves closed. You can reuse your factory OEM Porsche tips or you can opt for DesignTek tail pipes

Please note the remote controlers do not come with batteries. You will have to source them at your own cost. The type is CR2025

Installation instructions for Valvetronic Mufflers CLICK HERE

Valve Controller Installation CLICK HERE

For Wiring Diagram please CLICK HERE

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Related, superseded, cross reference or alternative numbers for comparison.

3606009717
3606009717
99711197901S
3606409703
99711131130
99711131131
99711199531
99711113131
99711199631
99711131231
99711113230
99711151131
99711151231

The product you are viewing cross references to these numbers
Special Order item
99761355301A05
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Product Information
This is the switch required for the original Porsche sport exhaust

porsche

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
99761355301A05
99761355301
99704420004
99994420004

The product you are viewing cross references to these numbers
Special Order item
99761356301A05
Product Information
Product Information
This is the switch required for the original Porsche sport exhaust

porsche

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
99761356301A05
99761356301
99704420004
99994420004

The product you are viewing cross references to these numbers
DISPLAYING 1 to 5 (of 5 products)
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About Switchable Silencers / Mufflers

Porsche Switchable Silencers & Mufflers - Dual-Mode Performance Exhaust Systems

Switchable Silencers / Mufflers offer Porsche owners the best of both worlds—refined, road-friendly exhaust sound when cruising, and an aggressive, performance-focused tone at the touch of a button. Using valve-controlled technology, these exhaust systems allow drivers to switch between quiet and sport modes, delivering enhanced sound, performance, and driving engagement on demand.

Available from Design911, Porsche switchable silencers include both genuine Porsche-engineered systems and high-quality aftermarket performance options, all designed to integrate seamlessly with your vehicle’s existing exhaust components and control systems.

What Do Switchable Silencers / Mufflers Do?

Switchable silencers use internal exhaust valves to control sound level and exhaust flow.

Core Functions:

  • Allow selectable quiet and sport exhaust modes.
  • Improve exhaust gas flow under performance driving.
  • Enhance throttle response and engine efficiency.
  • Maintain refined sound levels for everyday driving.
  • Deliver a more engaging driving experience on demand.

These systems adapt your Porsche’s character to suit any driving situation.

Why Do Standard Exhaust Silencers Fail or Fall Short?

Factory exhaust systems are designed to meet noise regulations and long-term durability requirements, which can limit performance and sound. Common issues include:

  • Internal corrosion from heat and condensation.
  • Restrictive baffling reducing exhaust flow.
  • Fixed sound levels with no adaptability.
  • Valve or actuator wear in older switchable systems.
  • Limited performance compatibility with tuned engines.

Over time, standard silencers may lose efficiency, sound quality, or reliability.

Why Upgrade to Switchable Silencers / Mufflers?

Upgrading to a switchable exhaust system enhances both performance and versatility.

Upgrade Benefits:

  • Dual-mode exhaust sound at the press of a button.
  • Improved exhaust flow for better performance.
  • Sportier, more engaging exhaust note when desired.
  • Maintains comfort and compliance in quiet mode.
  • Ideal for road, touring, and spirited driving.

Whether OEM or aftermarket, switchable silencers offer flexibility without compromise.

Highlights

  • Porsche switchable silencer and muffler upgrades
  • Valve-controlled exhaust sound adjustment
  • OEM Porsche and premium aftermarket options
  • Improved performance, sound, and driving engagement
  • Compatible with factory systems and controls       

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