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Porsche > Cayman 987C / 981C (2005-2016) > Exhausts >

Fabspeed Exhaust

Fabspeed Exhaust

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Valvetronic GT3 Muffler Conversion Kit. Porsche 981 Cayman GT4 / Spyder - 98111192106, 98111192206 - FS.POR.981GT4.GT3CK, FS.POR.981GT4.GT3CKB, FS.POR.981GT4.GT3CKBR, FS.POR.981GT4.GT3CKC, FS.POR.981GT4.GT3CKP, FSPOR981GT4GT3CK
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Valvetronic GT3 Muffler Conversion Kit. Porsche 981 Cayman GT4 / Spyder
FSPOR981GT4GT3CK
Product Information
Product Information
Valvetronic GT3 Muffler Conversion Kit.



Porsche Boxster Cayman owners have requested a conversion kit that allows the installation of a Porsche OEM 991 GT3 center muffler onto their cars. Fabspeed Motorsport listened and designed in CAD and built inhouse a lightweight installation kit that allows any 6 speed Porsche 981 GT4 or Spyder owner to install an OEM GT3 center muffler (A PDK version will also be available once we are able to test fitment). This kit also allows the installation of a Fabspeed 991 GT3 Center Muffler Bypass Pipe or 991 GT3 Center Mini Maxflo Performance Exhaust onto your 981 GT4/Spyder.

The system consists of 2.5" 63.5mm CNC mandrel bent one piece Left and Right side over axle pipes and clamps. Then a set of valved side muffler inlet Y-pipes that retain the factory PSE valved exhaust functionality. The valves are OEM Porsche GT3 HELICAL vacuum-actuated exhaust valves that are imported from the U.K. We use our FLOW Waterjet to cut a CAD designed, lightweight, stainless steel mounting bracket to hold the muffler; hardware for installation is included. This and the Factory Porsche muffler band straps hold everything in place. For tips, you can use the factory 991 GT3 tips or you can order our custom exhaust tip mount with any choice of our signature tips.

SOUND: Enjoy the characteristic sound of a factory Porsche engineered exhaust but with a nice increase in volume! With PSE off (valves closed), the exhaust is still tame and livable in the cabin. However, with PSE on (valves open) hear that flat 6 howl up to redline! The larger over axle pipes that are included also contribute to the overall louder tone.

POWER: The 991 GT3 muffler was designed by Porsche to support 475 HP, because of this it flows a lot better than the 981 GT4 muffler that was only designed for 385 HP. We expect this increase in flow, helped by our larger over axle pipes and muffler inlets, to give a nice HP increase.

FEATURES:
  • Fits all 6 speed manual Porsche 981 Cayman GT4 / 981 Boxster Spyder vehicles (2015-2016). A PDK version will also be available once we are able to test fitment
  • Choose between your choice of Premium Fabspeed Exhaust Tips or use OEM 991 GT3 Tips.
  • CNC Mandrel bent 2.5" 63.5 precision over axle pipes to valvetronic inlet pipes
  • Helical Aerospace United Kingdom exhaust valves- same OEM quality valves used on Porsche GT3, GT3RS. Made with Silica carbide.
  • Constructed from 14-16ga T304L stainless steel tubing for maximum power and durability
  • Direct bolt-on installation; no cutting or welding required
  • All Fabspeed performance products are backed by the Fabspeed Lifetime Limited Warranty.


NOTE: OEM GT3 center muffler is NOT included

Please note: This is a special-order item manufactured to order. In some cases, please allow 4 – 5 weeks for the delivery. Special order items cannot be cancelled from this supplier once your order has been placed.



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

FSPOR981GT4GT3CK
98111192106
98111192206

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About Fabspeed Exhaust

Fabspeed Exhaust Systems - Precision Performance & Sound Upgrades

Fabspeed Exhaust Systems are premium performance exhaust upgrades engineered to deliver increased power, improved exhaust flow, and a distinctive motorsport-inspired sound. Designed and manufactured with precision engineering and performance testing at their core, Fabspeed exhausts are built to enhance the driving experience of Porsche road and track vehicles alike.

Available from Design911, Porsche Fabspeed exhaust components are crafted using high-quality stainless steel and optimised designs to reduce backpressure, improve throttle response, and unleash a more engaging exhaust tone while maintaining durability and reliability.

What Do Fabspeed Exhaust Systems Do?

Fabspeed exhausts optimise exhaust gas flow and acoustic performance.

Core Functions:

  • Reduce exhaust restriction and backpressure.
  • Improve throttle response and power delivery.
  • Enhance exhaust sound and character.
  • Improve engine efficiency and breathing.
  • Upgrade exhaust aesthetics and build quality.

A high-flow exhaust system plays a key role in unlocking engine performance.

Why Do Standard Exhaust Systems Fail or Limit Performance?

Factory exhaust systems are designed to prioritise emissions compliance, cost efficiency, and sound suppression. Over time, they can suffer from:

  • Restrictive internal baffling reducing performance.
  • Corrosion from moisture and repeated heat cycles.
  • Excessive weight limiting efficiency.
  • Muted exhaust sound lacking engagement.
  • Reduced compatibility with performance tuning upgrades.

As engines are pushed harder, standard exhausts can become a performance bottleneck.

Why Upgrade to a Fabspeed Exhaust?

Fabspeed exhaust systems are designed for drivers seeking performance-focused enhancements.

Upgrade Benefits:

  • Improved exhaust flow for increased performance.
  • Sportier, more aggressive exhaust sound.
  • Lightweight, durable stainless steel construction.
  • Precision-engineered components for perfect fitment.
  • Ideal for performance road cars and track applications.

Upgrading to Fabspeed delivers noticeable gains in sound, response, and driving excitement.

Highlights

  • Porsche Fabspeed performance exhaust systems
  • Improved exhaust flow and throttle response
  • Sporty, motorsport-inspired exhaust sound
  • High-quality stainless steel construction
  • Designed for performance and enthusiast driving       

Fabspeed Exhaust

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