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Valvetronic GT3 Muffler Conversion Kit. Porsche 981 Cayman GT4 / Spyder ❭ FSPOR981GT4GT3CK
- Porsche Boxster 981 Spyder 3.8L 2016
- Porsche Cayman GT4 3.8L 2015-16

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
The product you are viewing cross references to these numbers
- Porsche Boxster 987 MKII 2.9L 2009-12
- Porsche Boxster S 987 MKII 3.4L 2009-12
- Porsche Cayman 2.9L 987C MKII 2009-12
- Porsche Cayman S / R 3.4L 987C MKII 2009-12

INCLUDES:
• Maxflo Mufflers with Deluxe Dual Style Tips,
• Sport Headers,
• BMC F1 Air Filter
FEATURES:
• Fits all Porsche 987.2 Boxster/Cayman vehicles (2009-2012)
• This performance package includes Fabspeed's Ver. 2 Maxflo muffler system with secondary catbypass pipes (987.1 only) and dual-style, 3.5" polished tips / sport headers with 200 cell, German imported HJS sportcats / BMC air filter.
• High quality, 14-16 gauge T304 stainless steel, C.N.C. mandrel bent tubing for maximum power.
• Improved throttle response and sportscar sound.
• Direct bolt-on application to replace the factory exhaust system.
• Will not void factory warranty.
• Complies with emissions and inspections.
• No Check Engine Light.
• All Fabspeed performance products are backed by the Fabspeed Lifetime Limited Warranty
NOTE: Fabspeed's 200-cell high-flow catalytic converters are not C.A.R.B. certified and are for Off-Road Use ONLY in the state of California
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.
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.
FSPOR9872SPKG
The product you are viewing cross references to these numbers
- Porsche Boxster 987 MKII 2.9L 2009-12
- Porsche Boxster S 987 MKII 3.4L 2009-12
- Porsche Cayman 2.9L 987C MKII 2009-12
- Porsche Cayman S / R 3.4L 987C MKII 2009-12

FEATURES:
• Fits all Porsche 987.2 Boxster/Cayman Vehicles (2009-2012)
• Available with Polished or Black Chrome Deluxe Dual-Style tips or optional Carrera GT Style Tip upgrade
• Increases horsepower and torque by 13 whp and 10 ft-lbs
• Saves 40 lbs from the rear of the vehicle compared to the full OEM exhaust system
• Includes two 2.25" resonators to minimize weight and improve top-end performance
• Constructed from high quality 14-16ga CNC mandrel-bent T304 stainless steel for maximum performance and durability
• Noticeable improvement in sports car sound and throttle response
• Direct replacement for the OEM muffler with no cutting or welding required
• All Fabspeed performance products are backed by the Fabspeed Lifetime Limited Warranty
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.
FSPOR9872SCUP
The product you are viewing cross references to these numbers
- Porsche Boxster 987 MKII 2.9L 2009-12
- Porsche Boxster S 987 MKII 3.4L 2009-12
- Porsche Cayman 2.9L 987C MKII 2009-12
- Porsche Cayman S / R 3.4L 987C MKII 2009-12

Stainless steel outlet tips replace the factory outlets for a sportier look.
FEATURES:
• Fits all Porsche 987.2 Boxster/Caymans (2009-2012)
• Available in Polished Chrome, Black Chrome, and Carbon Fiber finishes.
• Compatible with all Fabspeed exhaust systems as well as the OEM mufflers
• Simple DIY installation with no cutting or welding required
• All Fabspeed performance products are backed by the Fabspeed Lifetime Limited Warranty
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.
FSPOR9872DLTP
The product you are viewing cross references to these numbers
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