How to tell which engine I have? (n54 or n55) - BMW 1 Series Coupe Forum / 1 Series Convertible Forum (1M / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i)
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BMW B58 vs N55 Engines: A brief but proper look at the differences & similarities between the two... - YouTube
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