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The Supertech black-nitrided exhaust valve for BMW M50, M52, S50 and S52 engines is a single replacement item sold as a drop-ship product. The black nitride finish is specified in the description and the valve is provided individually for valve-train repair or selective replacement during service and rebuilds of these BMW engine families.
Supertech BMW M50/M52/S50/S52 Black Nitrided Exhaust Valve - Single (Drop Ship Only)
