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Porsche > 991 (911) MK2 2016-2019 > 991.2 GT3 4.0L (500 Bhp) / GT3 RS 4.0L (520 Bhp) 2017-19 > Exhausts >

Switchable Silencers / Mufflers

Switchable Silencers / Mufflers

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DISPLAYING 1 to 4 (of 4 products)
Sports exhaust Porsche 991.3 GT3 and Speedster - 9GT251052E
7
Sports exhaust Porsche 991.3 GT3 and Speedster
TSPO991GT3RS19.001.A
Product Information
Product Information
Sports exhaust Porsche 911 (991.3) GT3 and Speedster 2019



Fits
Porsche 911 (991.3) GT3 2019
Porsche 911 (991.3) Speedster 2019

RACETRACK USE ONLY
These components are designed and developed for racetrack use and to maximise the car's performance. They are not street legal and must be installed by professionals in the sector

INSTALLATION
Must be installed with OE headers for GPF (Gasoline Particulate Filter)
The component is perfectly interchangeable with the original components, following the instructions in the constructor's workshop manual

SOUND - STRAIGHT PIPE
The straight pipe version guarantees a direct path from the engine, removing all factors which may affect the acoustic tuning

END TIPS DESIGN - OBLIQUE CUT
Oblique-cut tailpipe with internal rolled lip

END TIPS DIMENSION- 100mm
The value refers to the external dimensions of the exhaust end tip

EXHAUST AND END TIPS FINISH - POLISHED
Mirror finishes are highly reflective and created by polishing the stainless steel. The polishing process enhances appearance and consistency, making cleaning easier. A special rolling procedure is used. It is essential to remove deep scratches as any surface defects will be very noticeable on the finished product. it improves corrosion resistance. The polishing eradicates crevices where corrosive particles can lodge themselves

END TIPS NUMBER AND POSITION - 2 CENTRAL
The end tips emerge from the centre

MATERIAL
AISI 304 STAINLESS STEEL
A choice stainless steel ideal for aggressive environments where combustion emissions can cause serious chemical corrosion on other types of metal

MAIN PIPE DIMENSION - 76
This is the diameter in mm of the main pipe of the exhaust system
EXHAUST VALVE
ELECTRIC
The exhaust system is complete with electric valve. The electric actuator is not included and the standard actuator already installed on the car must be used. Control of the original valve is still provided

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Related, superseded, cross reference or alternative numbers for comparison.

TSPO991GT3RS19.001.A
9GT251052E

The product you are viewing cross references to these numbers
Sports exhaust side silencer straight pipe with valves Porsche 991 GT3 and GT3 RS - 99711104782, 99711104784, 99711104781, 99711104882, 99711104881, 99711104884
5
Sports exhaust side silencer straight pipe with valves Porsche 991 GT3 and GT3 RS
3606609145
Product Information
Product Information
Sports exhaust side silencer straight pipe (with valves) Porsche 991GT3 and GT3 RS
Bypass pipes for side mufflers.



Fits
Porsche 911 GT3 and GT3 RS (991.1 and 991.2 2014-2019)

RACETRACK USE ONLY
These components are designed and developed for racetrack use and to maximise the car's performance. They are not street legal and must be installed by professionals in the sector

Material: Stainless Steel 304
Replacement for Genuine muffler 991.111.048.81



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

3606609145
99711104782
99711104784
99711104781
99711104882
99711104881
99711104884

The product you are viewing cross references to these numbers
Sports exhaust side silencer straight pipe with valves Porsche 997 GT3 and GT3 RS
3
Sports exhaust side silencer straight pipe with valves Porsche 997 GT3 and GT3 RS
TSPOGT3C10.093.A
Product Information
Product Information
Sports exhaust side silencer straight pipe with valves.
Replaces rear side silencers with straight pipes



Fits:
Porsche 911 GT3 and GT3 RS (997 Gen 1 and Gen 2)
Porsche 911 GT3 and GT3 RS (991.1 and 991.2 upto 2019)

This product can be mounted on every GT3, GTR RS, GT3 RS 4.0 versions, both on 997 Gen 1, Gen 2 and on 991.1 and 991.2 up to 2019

The component is perfectly interchangeable with the original components, following the instructions in the constructor's workshop manual

RACETRACK USE ONLY
These components are designed and developed for racetrack use and to maximise the car's performance. They are not street legal and must be installed by professionals in the sector

SOUND - STRAIGHT PIPE
The straight pipe version guarantees a direct path from the engine, removing all factors which may affect the acoustic tuning

SYSTEM FINISH - POLISHED
Mirror finishes are highly reflective and created by polishing the stainless steel. The polishing process enhances appearance and consistency, making cleaning easier. A special rolling procedure is used. It is essential to remove deep scratches as any surface defects will be very noticeable on the finished product. it improves corrosion resistance. The polishing eradicates crevices where corrosive particles can lodge themselves

MATERIAL - AISI 304 STAINLESS STEEL
A choice stainless steel ideal for aggressive environments where combustion emissions can cause serious chemical corrosion on other types of metal

MAIN PIPE DIMENSION - 65mm
This is the diameter in mm of the main pipe of the exhaust system
Universal Exhaust Vacuum Valve Controller - 9MUVCKIT
2
Universal Exhaust Vacuum Valve Controller
9MUVCKIT
Product Information
Product Information

9m Universal Exhaust Vacuum Valve Controller

Take greater control of a vacuum-operated sports exhaust system with the 9m Universal Exhaust Vacuum Valve Controller.

Developed by Ninemeister to enhance the functionality of exhaust valve systems, the controller allows the exhaust valves to be operated remotely using the supplied key fobs. The kit uses a vacuum control module and is designed for straightforward installation without cutting or splicing into the vehicle's factory wiring or fuses.

What Does the Exhaust Valve Controller Do?

Many sports exhaust systems use vacuum-operated valves to change the route exhaust gases take through the silencer. Opening or closing these valves alters the exhaust sound.

The 9m controller provides additional control over this system, allowing the driver to operate compatible vacuum exhaust valves using a dedicated remote key fob.

This is particularly useful for vehicles fitted with a valved sports exhaust where the owner wants convenient independent control of the exhaust valves.

Why Upgrade?

A dedicated exhaust valve controller gives the driver greater control over when the exhaust valves operate.

The 9m system is also designed to minimise installation complexity. Power is supplied through a cigarette lighter adaptor, so there is no requirement to cut or splice into the factory wiring or fuse system.

Kit Includes

  • 9m vacuum control module
  • Two remote-control key fobs
  • Vacuum tubing
  • Cigarette lighter power adaptor
  • High-quality remotes with Ninemeister logo
  • Components required for straightforward connection and installation

Key Features

  • Universal vacuum exhaust valve controller
  • Remote operation of compatible exhaust valves
  • Supplied with two key fobs
  • Simple power connection
  • No cutting of factory wiring required
  • No splicing into factory fuses
  • Ideal for compatible valved sports exhaust systems
  • Ninemeister branded remote controls

Universal Vacuum Exhaust Valve Controllers

A vacuum exhaust valve controller is an ideal addition to a compatible valved sports exhaust, giving the driver convenient remote control over exhaust valve operation.

Rather than relying solely on the vehicle's original exhaust valve strategy, the 9m controller provides a dedicated remote-control solution while avoiding permanent modifications to the factory wiring.

For Porsche owners searching for a remote exhaust valve controller, vacuum-operated sports exhaust controller or universal valved exhaust remote, the 9m kit provides a simple solution suitable for compatible vacuum-controlled exhaust systems.

DISPLAYING 1 to 4 (of 4 products)
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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