GSC Power-Division Exhaust Valve Guide Set of 8-Standard (gsc3061-8) 4024 Note that the most dramatic

Note that the most dramatic sound improvements come when combined with mid-pipe replacement

Pushing The Limits Of ABS

Complete high-performance exhaust & exclusive tuning upgrade for 625+ HP

*Some photos show our optional F90 M5 Intake system available separately

GSC Power-Division Exhaust Valve Guide Set of 8-Standard (gsc3061-8) 4024 Note that the most dramaticGSC has quite simply made a series of valve guides that fit properly, are easier to install, and shaped to help air flow instead of just copying the OEM design. The GSC Power Division valve guides are made from true C67410 Manganese Bronze and turned on a dedicated precision CNC turning center. What this means for you and your installer is less time fitting guides to the head due to holding the tightest tolerances in the industry with the best quality