GSC Power-Division 23-8N Single Exhaust Valve-33mm (+1mm) (gsc2013-01) FITMENT_TOURING_SPORT This version of the 991

This version of the 991 Turbo /S plenum utilizes the factory 74mm throttle body and delivers impressive performance gains throughout both horsepower and torque curves for both stock and modified Turbos

The R35 GT-R intercooler is no exception as this core is produced by the same company used for our world record holding 1400HP drag car and our multi-championship winning time attack race team

Thanks to laser-etched timing and directional marks

no more need to perform a costly redo of the fuel system just to install a carburetor

Right for your vehicle and racing lifestyle

GSC Power-Division 23-8N Single Exhaust Valve-33mm (+1mm) (gsc2013-01) FITMENT_TOURING_SPORT This version of the 991When creating our new valve line we set out to create the best performance, longest lasting valves available to the aftermarket. Using advanced 3D design and simulation software, we have created a stronger and higher flowing valve head design. We flow test prototype valve heads in the specific applications to make sure we have the highest flowing valve head available on the market today. With the materials used, we have less valve distortion at the