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S55 F80/F82/F83/F87 M3, M4 and M2 competition

The S55 engine is the high performance version of the N55 engine. It was introduced in the F80 M3 and F82 M4, replacing the BMW S65 naturally aspirated V8 engine used in the previous generation M3.

Differences compared with the N55 include a closed-deck engine block, lightweight crankshaft, strengthened pistons, different valve material, twin turbos, twin fuel pumps, active exhaust and revised intercoolers

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