This manifold fits any E30 that has a 24v engine swapped in including M50, M52, S50, S52, and M54. This will NOT work with the E46 M3 S54 engine. Manifold is made with sch10 Stainless and 1/2″ flanges. The wastegate port accects a vband gate with a 2.5″ flange. The Trubosmart hypergate 45mm is one that will fit. Warrantied against cracking for 2 years.