The 2015 BMW M4 is the high-performance variant of the 4 Series coupe and convertible. It is powered by a twin-turbocharged 3.0-liter I-6 with 425 hp and 406 lb-ft of torque that's paired with a ...

The 4 Series debuted alongside the last-gen 3 Series, replacing what used to be called the 3 Series coupe and convertible. Just to add to the confusion, BMW calls a four-door variant the Gran Coupe.