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The Supertech black-nitrided exhaust valve set for BMW M3 S54 is supplied as 12 valves sized for the S54 head. With a nitrided finish noted in the description, this set is presented as a direct replacement option for the M3 S54 exhaust valvetrain when replacement valves are required during head service or rebuilding.
Supertech BMW M3 S54 Black Nitrided Exhaust Valve - Set of 12
