The BMW 6-Series Coupe will be equipped with different engine. A basic version is the 635i with a 3.0-liter turbocharged engine, a diesel version will also come with a 300 hp six-cylinder turbo diesel. For now, the most powerful version of the 650i with 407 hp from the 4.4-liter V8 twin-turbo until the M6 Coupé will make its appearance.