Supertech Black Nitride Intake/Exhaust Valves (DSM/Evo 8-10) Supertech Black Nitride Intake & Exhaust Valves. BLACK NITRIDE: This is a hardening treatment that even though it is not widely used as the chrome coating, it has several benefits and is becoming very popular, mainly for European and Japanese... MSRP: Was: Now: $180.96 Choose Options
