GSC Power-Division Intake/Exhaust Valve Guide Set (gsc3997-12) 1500 5" black coated T-304 stainless

5" black coated T-304 stainless steel tips

Includes thermal manifold flange gasket

this kit is equipped with a custom heat shield and a removable rain shield

this carbon fiber trunk lid offers durability

GSC Power-Division billet S3 camshafts for the USDM STi and WRX with Intake only AVCS

GSC Power-Division Intake/Exhaust Valve Guide Set (gsc3997-12) 1500 5" black coated T-304 stainlessWhen 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