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Exhaust valve kit SUBARU WRX 2.0L - DOHC 16 VALVE (EJ20, STI) - 2001-2008 8pcs Proton 7L V8 Diesel Engine -The Competition 6000 series valves have been designed to provide excellent reliability under high pressure conditions and cams, at budget prices. They have higher durability than the best valves of our competitors. For the production of valves, we use our exclusive two stage slow forging process, using EV8 stainless steel at inlet and exhaust valves. We provide a special process of heat treatment and stress relieving, along with hard chromium plated