Supertech Valve made in one piece forged stainless steel. Supertech Performance uses mainly SAE EV8 (UNS S63008) for the Intake and Exhaust valve. Black nitride layer reduces power loss thanks to less valve-guide friction.
Supertech Performance apply's different heat treatments to this material to obtain different hardness and ductility in accordance to application and budget (Street Performance or Heavy Duty Racing).
Vehicle/Engine applications: Subaru 2.0L WRX STi Turbo DOHC (EJ20)
Sold as a 16pc set (8 intake / 8 exhaust standard sized valves)