Wiseco VES002 Premium Stainless Steel Exhaust Valve Fits: Honda CRF450R 2002-2006, CRF450X 2005-2009 Wiseco's stainless steel valves are made from premium materials and manufactured to the highest quality specifications A one-piece, forged construction offers high strength and fatigue properties Chromium nitride coating offering surface hardness and wear resistance Each design is a drop-in application and requires no piston or head modifications and will work with stock springs and valve-train