Description

If you’re running high-RPM conditions or boost-dependent applications, your OEM valve train wasn’t designed to handle the sustained punishment. The PROX 28.SIS2424-2 replaces weak factory valves and springs with nitrided steel components engineered to eliminate valve float, reduce wear, and deliver reliable performance under extreme operating conditions. This is a straightforward bolt-on upgrade that uses your existing retainers and seals—no machine work required.

Built for serious racers and enthusiasts who demand durability without compromise, this kit pairs premium chrome vanadium springs with hardened steel valves to maintain valve seat integrity lap after lap.