GSC Power-Division Exhaust Valve Guide Standard Set with 6mm Stopper (gsc3021-8) StillenShipping_100 With that in mind

With that in mind

They match the overall shape and theme of the factory cover

Zinc plated for absolutely zero-slip

For the 2020 model year

With a larger 2-row 42mm core

GSC Power-Division Exhaust Valve Guide Standard Set with 6mm Stopper (gsc3021-8) StillenShipping_100 With that in mindGSC 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