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Porsche // Cayman 718C (982C) 2017>> // Cayman GTS 718 2.5L Manual (365 Bhp)
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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 Cayman GTS 718 2.5L Manual (365 Bhp)
- Porsche Cayman GTS 718 2.5L PDK (365 Bhp)
- Porsche Cayman GTS 718 4.0L Manual (400 Bhp)
- Porsche Cayman GT4 718 4.0L / GT4 RS 718 4.0L
For late model exhaust brackets
The Fabspeed Lightweight Competition Exhaust System for the 718 4.0L cars was specifically designed to be the lightest, best performing exhaust possible. Our design process started with 3D scanning the entire exhaust system using our CREAFORM 700 Handscan so that we could make a complete Solidworks 3D model of the exhaust. We then designed the exhaust and fixtures using that model so that the exhaust fit perfectly to OEM standards. After multiple revisions for sound and dyno testing we settled on 2.5' 63.5mm tubing with a crossover tube to increase exhaust scavenging and reduce drone. The flanges are thick 304 stainless steel that we CAD designed to perfectly match the OEM flanges and reuse the factory metal gaskets.
SOUND: This systems deletes the factory PSE valves so it always provides an aggressive snarl no matter what RPM you're at. This system will be a significant increase in volume, with minimal cabin drone in the lower rpm region.
FEATURES:
• Fits all 718 Cayman GT4 / GTS / Spyder Cars 2020+
For late model exhaust brackets
• Saves 17lbs / 7.3kg over the factory PSE muffler
• Constructed from high-quality 14-16ga CNC mandrel-bent T304L stainless steel for optimum flow and maximum durability
• Crossover tube helps with exhaust scavenging and reduces drone
• Emissions legal in all 50 states
• No Check Engine Light guaranteed
• Direct simple bolt-on installation, no cutting or welding required
• Backed by Fabspeed's Lifetime Warranty.
NOTE: Porsche changed the exhaust brackets on the 718 GT4 and Spyder somewhere around the February 2020 build date. Before purchasing you MUST check to see if your 718 GT4/Spyder has the early or late style exhaust brackets. Please see the example photos below.

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.
FSPOR718GT4LCE
The product you are viewing cross references to these numbers
- Porsche Boxster Spyder / Spyder RS 718 4.0L 01/2019>>
- Porsche Cayman GTS 718 2.5L Manual (365 Bhp)
- Porsche Cayman GTS 718 2.5L PDK (365 Bhp)
- Porsche Cayman GTS 718 4.0L Manual (400 Bhp)
- Porsche Cayman GT4 718 4.0L / GT4 RS 718 4.0L
For late model exhaust brackets
The Fabspeed Valvetronic X-Pipe Exhaust System for the 718 4.0L cars wakes up the sleepy Porsche PSE exhaust and gives them a truly exotic sports car sound all while retaining the functionality of PSE (Porsche Sport Exhaust). Our design process started with 3D scanning the entire exhaust system using our CREAFORM 700 Handscan so that we could make a complete Solidworks 3D model of the exhaust. We then designed the exhaust and fixtures using that model so that the exhaust fit perfectly to OEM standards. After multiple revisions for sound and dyno testing we settled on using our CAD flow engineered investment cast X-Pipe and 2.5" 63.5 mm tubing for the most power and exotic sports car sound. The CAD flow modeled X-pipe is an exclusive Fabspeed part that gives a smooth high pitched exotic sound and flows much better than a X-Pipe handmade from U bends cut and welded together. The exhaust valves we use are made by Helical Limited in the United Kingdom. These ISO 9001 certified valves are the same ones Ferrari, McLaren and Porsche use on their GT cars. The flanges are thick 304 stainless steel that we CAD designed to perfectly match the OEM flanges and reuse the factory metal gaskets.
SOUND: With PSE off our Valvetronic exhaust gives a nice increase in volume without any cabin drone. With PSE on and the valves open it turns the 4.0L's exhaust note into a truly exotic sound with a significant increase in volume. This system will turn heads as you rip by.
POWER: When used in conjunction with our GPF Delete Over Axle Pipes we saw a gain of 14 HP and 32 ft/lbs of TQ at 2400 RPM, 8 HP and 9 ft/lbs of TQ at 4900 RPM and 12 HP and 8 ft/lbs of TQ at 7500 RPM. This is low end torque you'll really feel around town and horsepower that continues all the way up to redline.
FEATURES:
• Fits all 718 Cayman GT4 / GTS / Spyder Cars 2020+ (For late model exhaust brackets)
• Significant Dyno gains across the RPM band. +32ft/lbs TQ @ 2400RPM, +18ft/lbs TQ @ 3600RPM, and +15.5HP @ 7100RPM
• Helical Limited U.K. Silicon Carbide exhaust valves
• CAD designed X-Pipe made using investment casting for maximum possible flow and spectacular sports car sound
• Constructed from high-quality 14-16ga CNC mandrel-bent T304L stainless steel for optimum flow and maximum durability
• Emissions legal in all 50 states
• No Check Engine Light guaranteed
• Direct simple bolt-on installation, no cutting or welding required
• Weight savings of 4lbs 1.8KG vs the factory PSE exhaust
• Backed by Fabspeed's Lifetime 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.
FSPOR718GT4VLV
The product you are viewing cross references to these numbers
- Porsche Boxster Spyder / Spyder RS 718 4.0L 01/2019>>
- Porsche Cayman GTS 718 2.5L Manual (365 Bhp)
- Porsche Cayman GTS 718 2.5L PDK (365 Bhp)
- Porsche Cayman GTS 718 4.0L Manual (400 Bhp)
- Porsche Cayman GT4 718 4.0L / GT4 RS 718 4.0L
For early model exhaust brackets
The Fabspeed Valvetronic X-Pipe Exhaust System for the 718 4.0L cars wakes up the sleepy Porsche PSE exhaust and gives them a truly exotic sports car sound all while retaining the functionality of PSE (Porsche Sport Exhaust). Our design process started with 3D scanning the entire exhaust system using our CREAFORM 700 Handscan so that we could make a complete Solidworks 3D model of the exhaust. We then designed the exhaust and fixtures using that model so that the exhaust fit perfectly to OEM standards. After multiple revisions for sound and dyno testing we settled on using our CAD flow engineered investment cast X-Pipe and 2.5" 63.5 mm tubing for the most power and exotic sports car sound. The CAD flow modeled X-pipe is an exclusive Fabspeed part that gives a smooth high pitched exotic sound and flows much better than a X-Pipe handmade from U bends cut and welded together. The exhaust valves we use are made by Helical Limited in the United Kingdom. These ISO 9001 certified valves are the same ones Ferrari, McLaren and Porsche use on their GT cars. The flanges are thick 304 stainless steel that we CAD designed to perfectly match the OEM flanges and reuse the factory metal gaskets.
SOUND: With PSE off our Valvetronic exhaust gives a nice increase in volume without any cabin drone. With PSE on and the valves open it turns the 4.0L's exhaust note into a truly exotic sound with a significant increase in volume. This system will turn heads as you rip by.
POWER: When used in conjunction with our GPF Delete Over Axle Pipes we saw a gain of 14 HP and 32 ft/lbs of TQ at 2400 RPM, 8 HP and 9 ft/lbs of TQ at 4900 RPM and 12 HP and 8 ft/lbs of TQ at 7500 RPM. This is low end torque you'll really feel around town and horsepower that continues all the way up to redline.
FEATURES:
• Fits all 718 Cayman GT4 / GTS / Spyder Cars 2020+ (For early model exhaust brackets)
• Significant Dyno gains across the RPM band. +32ft/lbs TQ @ 2400RPM, +18ft/lbs TQ @ 3600RPM, and +15.5HP @ 7100RPM
• Helical Limited U.K. Silicon Carbide exhaust valves
• CAD designed X-Pipe made using investment casting for maximum possible flow and spectacular sports car sound
• Constructed from high-quality 14-16ga CNC mandrel-bent T304L stainless steel for optimum flow and maximum durability
• Emissions legal in all 50 states
• No Check Engine Light guaranteed
• Direct simple bolt-on installation, no cutting or welding required
• Weight savings of 4lbs 1.8KG vs the factory PSE exhaust
• Backed by Fabspeed's Lifetime 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.
FSPOR718GT4VLV
The product you are viewing cross references to these numbers
- Porsche Boxster GTS 718 2.5L Manual (365 Bhp) 05/2017>>
- Porsche Boxster GTS 718 2.5L PDK (365 Bhp) 05/2017>>
- Porsche Boxster GTS 718 4.0L Manual (400 Bhp) 01/2019>>
- Porsche Boxster GTS 718 4.0L PDK (400 Bhp) 01/2019>>
- Porsche Boxster Spyder / Spyder RS 718 4.0L 01/2019>>
- Porsche Cayman GTS 718 2.5L Manual (365 Bhp)
- Porsche Cayman GTS 718 2.5L PDK (365 Bhp)
- Porsche Cayman GTS 718 4.0L Manual (400 Bhp)
- Porsche Cayman GTS 718 4.0L PDK (400 Bhp)
- Porsche Cayman GT4 718 4.0L / GT4 RS 718 4.0L
For late model exhaust brackets
Fabspeed's 718 Street Performance Package is the premium solution for adding dynamic performance and superlative sound to your GT4 / GTS / Spyder on the street. Delivering well over 400 horsepower to the wheels with easy-to-install bolt-on upgrades (on a GT4), there is no better option for the GT4 owner seeking maximum power and performance while retaining catalysts and the stock ECU tune. No need to suffer long periods of downtime for an engine build. Simply install the Fabspeed 718 Street Performance Package and get all the power you need. Fully street and racetrack tested on PDK and Manual cars!
SOUND:
With PSE (Porsche Sport Exhaust) on and the valves open, this system turns the 4.0L's exhaust note into a truly exotic sound with a significant increase in volume. This system will turn heads as you rip by, some jeers from the nearby pedestrians may have you hitting the accelerator a little more often. Tolerable enough for street driving and highway cruising but definitely not a subtle sunday-mass regular.
POWER:
After many dyno hours and incremental refinements to our design we were able to achieve dyno gains of 27 WHP and 19 FT/LBS of TQ at 7500 RPM. Best of all, power gains are seen as low as 3700 RPM, so there are power gains across the entire power band!
INCLUDES:
• Fabspeed Valvetronic X-Pipe Exhaust
• Fabspeed RENNKRAFT™ Modular Street and • Racing Headers with HJS Catalytic Converters
• Fabspeed Over Axle GPF Delete Pipes
• BMC F1 Replacement Air Filters
FEATURES:
• Fits all Porsche 718 Cayman/Boxster GT4/GTS/Spyder Cars (2020+) (Please see note below for how to identify if your car has early or late model exhaust brackets)
• Significant Dyno gains across the RPM band 27 WHP and 19 FT/LBS of TQ
• Weight savings of -20 lbs / -9 KG's
• Constructed from CNC mandrel-bent T304L stainless steel
• We only use high quality, metallic core, 200 cell HJS catalytic converters
• The Valvetronic system uses Helical Valves imported from the U.K. which are the highest quality valves on the market
• Side effects may include extreme euphoria and uncontrollable laughter. Some users have expressed acceleration-induced excitement.
• Fabspeed is not responsible for miles per gallon lost, however; smiles per gallon gained is entirely our fault
• Optimized for maximum performance with no check engine light, guaranteed (USA Models Only, EU models please inquire)
• Choose between real Carbon Fiber, Satin Black, Polished Stainless, Brushed Stainless, or Re-use your OEM tips
• Simple bolt-on installation, no cutting or welding required
• Fabspeed has over 25+ years of Porsche air and water cooled excellence
• All Fabspeed performance products are backed by the Fabspeed Lifetime Warranty
Note: On the 718 GT4 and Spyder, Porsche used early model exhaust brackets up until roughly the February 2020 build date. After the February 2020 build date Porsche switched to the late model exhaust brackets. Before purchasing you MUST check to see if your 718 GT4/Spyder has the early or late style exhaust brackets. Please see the example photos below
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.
FSPOR718GT4SPKG
The product you are viewing cross references to these numbers
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