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How does the North-American-spec version of the S54-powered M coupe differ mechanically?

April 26, 2017Coupe differ mechanically north-american-spec s54-powered version

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How does the North-American-spec version of the S54-powered M coupe differ mechanically?

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All of the updated M coupes sold worldwide are powered by the S54 engine, as used in the E46 M3. European-spec versions are rated at 325 hp (DIN), while North American versions produce 315 hp (SAE), which translates to about 320 hp (DIN). The small loss in power can be attributed to the more restrictive placement of the catalysts on North American-spec cars in order to improve cold-start emissions. All S54-powered M coupes have an electronically-limited top speed of 155 mph (S52-powered M coupes were limited to 137 mph), though the U.S.-spec model is not equipped with the two-piece floating front brake calipers.