GSC Power-Division Single Exhaust 23-8N Chrome Polished Valve 31.5mm (+1mm) for 4G63T (gsc2003-01) _414-Z005 GrimmSpeed has proven that our

GrimmSpeed has proven that our exhaust products are some of the highest-quality and best-performing in the industry because of the detail oriented approached that we put into their development

Engineered with aerospace-grade carbon fiber material

VIS Racing Carbon Fiber Hood 10HYGEN2DPL-010C

Measured Flow: 310CFM @ 7" H2O

GSC Power-Division Single Exhaust 23-8N Chrome Polished Valve 31.5mm (+1mm) for 4G63T (gsc2003-01) _414-Z005 GrimmSpeed has proven that ourWhen 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