GSC Stainless Steel Intake Valves STD Size - 2004-2021 STI / 2002-2014 WRX | 2011-8

When creating their new valve line they set out to create the best performance longest lasting valves available to the aftermarket. Using advanced 3D design and simulation programs they have created a stronger and higher flowing valve head design. They flow test prototype valve heads in the specific applications to make sure they have the highest flowing valve head available on the market today. With the materials used they have less valve distortion at the face than any of the tested designs. Less distortion allows or better sealing under extreme conditions and more consistent performance through the life of the valve. GSC Power-Division's new valves are sure to become the industries standard for sport compact performance valves. Valve Features•Swirl polished heads for smoother air flow over the valve •Back cut to reduce valve weight for higher rpm, higher boost pressure and allow for more aggressive cam profiles without increasing valve spring seat pressures. •Valve stems are micropo