The Supertech black-nitrided intake valve set for BMW S50B32 consists of 12 intake valves sized for the S50B32 engine. The product description specifies black nitriding and the set is presented as a direct replacement for intake valvetrain service or cylinder-head rebuilds on vehicles using the S50B32.
Supertech BMW S50B32 Black Nitrided Intake Valve - Set of 12