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Daniel Johnson (not verified)    January 6, 2016 - 11:55AM

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You need to read the entire sentence. It says they took the M3/M4's new motor (the S55), and borrowed a few pieces from it for the M2's motor. The M2 motor is an N55 based unit, same as that found in the M235i, 335i, 435i, etc, but with a few components pulled from the M3/M4's S55 motor, allowing them to extract ~40hp more than the x35i cars.

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