981 GT4/Spyder/Clubsport

981 GT4 Club Sport Race Headers


Click on a photo to enlarge.

Race Headers are for Non USA or Racing Vehicles in the US.


Dundon 981 Cayman GT4 Club Sport Race Headers provide substantial gains in torque and horsepower throughout the rev range.  They are a race system so are for track or offroad use.  All Dundon headers are made with 321SS, the advantages of this are numerous and include, better fitment, higher heat tolerance, superior resistance to exhaust gas corrosion and a lifetime structural warranty to the original purchaser. 

The headers attach to the factory  muffler and are quiet with no drone  but put your foot down and they're all kinds of flat six glory.

Dundon Headers are specifically designed for each vehicle and engine.  Unlike our competition that uses a one size fits all, we tailor each system to the unique needs of each engine.

Dyno showing  Race Headers, no tune.

Gains Over Stock.

3600 RPM: +42 wtq
5000 RPM: +36 wtq, +34whp
5800 RPM: +15 wtq, +16whp
6500 RPM: +28whp
7000 RPM: +30whp
7500 RPM: +41whp

Our dyno read the stock car at 330.8 whp at 7400, Porsche rates the car at 385bhp at 7400, this is 14.1% loss with our Dynapack 4000 hub dyno running the car in Rolling Road mode using the factory PIWIS tools.

Dundon Race Header equipped GT4CS is now at: 426BHP

Dundon 991 GT3 Stage 2 chasing GT4 Stage 2



Andrew from Bridgeport, WV
Absolutely incredible! The Race headers transform the GT4 into what it is truly meant to be. Under 3k RPM or light throttle input the car is basically as quiet as stock. Once you start to creep over 4k RPM or get heavy with the throttle input, the car is completely transformed into what could easily be mistaken for a cup car. The headers, coupled with the Cobb tune, smooth out the mid range and the torque stays constant and consistent to redline. Installation was simple and straight forward. No drone, more power and incredible sound. What more could you want?! In fact, you're wasting time reading this review. Just order them!

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