BMW N54B30, N55B30, S55B30 INTAKE MANIFOLD ADAPTER FOR BMW M50, M52 and M52TU, M54 (PORTING) ENGINES. Designed for direct installation of the M52TU/M54 fuel rail(M50 and M52 fuel rails do not fit). Can also be used with M52B25TU, M52B28TU, M54B25, and M54B30 engines after porting the intake ports of the cylinder head to the M50/M52 standard – in this case, significant performance gains can be achieved.
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