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Supertech manganese bronze exhaust valve guides for BMW N55 and S55 engines are supplied as a set of 12 with a 6mm stem bore, intended to replace worn guides in those specific applications. These guides serve the practical purpose of supporting exhaust valve stems and maintaining alignment in high-temperature exhaust ports for the listed BMW turbocharged engines.
Supertech BMW N55/S55 6mm Stem Manganese Bronze Exhaust Valve Guide - Set of 12
