The current BMW 4 Series is available in a few flavors. The range-topper is obviously the fearsome M4 Competition and its twin-turbocharged 3.0-liter inline-six engine. A step down is the M-kissed M440i that also wields a boosted six, but is significantly less powerful. In U.S. spec, the M440i generates 382 horsepower (285 kilowatts) compared to 503 hp (375 kW) for the M4 Competition
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