The BMW 645i is a high-performance, two-door luxury gran turismo manufactured by German automaker BMW between 2003 and 2010. It is based on the E63/E64 platform, and is part of the BMW 6 Series line-up. It is powered by a 4.4-liter V8 engine, which produces 333 horsepower and 361 pound-feet of torque. It is mated to either a 6-speed manual or 6-speed automatic transmission.