The PROX Steel Valve Kit offers top-quality components made from nitrided steel, providing superior micro-hardening to significantly reduce friction and wear. This leads to a longer lifespan compared to original valves, making it the optimal replacement for short-lived titanium valves. The kit includes a specially weight-adjusted set of steel valve springs made from chrome-vanadium, for extra high rev durability. Designed for easy installation with no modifications required to the original parts. Perfect for those looking to upgrade their engine's performance and longevity without the hassle of extensive modifications.