First used on a two-door coupe during the 1970s and 1980s, the 6 Series moniker returned to the BMW line-up for the 2004 model year. Based on the same platform as the BMW 5 Series, the 2004 BMW 6 Series also shared many styling cues with the four-door sedan. A 2+2 interior found inside the sporty coupe included automatic climate control and an array of standard airbags. Other standard features found on the 2004 BMW 6 Series included xenon headlights, rain-sensing windshield wipers and 18-inch aluminum wheels. The 2004 BMW 6 Series was introduced as a coupe and convertible equipped with a 4.4-liter V-8 engine developing 325 horsepower. Three transmission choices were presented on the 2004 model year 6 Series with a six-speed manual, six-speed automatic and a six-speed sequential manual gearbox. In 2006, the BMW M6 model came to life by dropping a 500-horsepower, 5.0-liter V-10 engine into the 6 Series. The base BMW 6 Series received an enlarged V-8 engine for 2006 pumping out 360 horsepower. Provided with a sportier, more sophisticated appearance, the 6 Series was completely redesigned for 2012. The 2012 BMW 6 Series also received a host of technological enhancements including an available 3-D heads-up display along with a Top View camera system. Retaining a V-8 engine option generating 400 horsepower, the 2012 BMW 6 Series was also available with a twin-turbocharged six-cylinder engine. The 2012 model year brought the option of the xDrive all-wheel drive system to the V-8 engined models of the BMW 6 Series. Joining the coupe and convertible body style in 2013, a four-door variant of the 6 series was made available called the BMW 6 Series Gran Coupe.
You have to decide between a coupe or a convertible, but either decision leads to 360 hp of driving enjoyment behind the wheel of the 2008 BMW 650, or even more power if you opt for the 500 hp M6 trim.