The first 6 Series models appeared in the 1970s as a continuation of BMW's elegant 2800 and 3.0 coupes, and continued in production until 1989. The Bavarian automaker put the 6 Series on hiatus while the 8 Series reigned supreme in the 1990s.
In 2004, however, the 6 Series returned, this time adding a convertible to the lineup. Controversial styling was notable for a bulging trunk lid—a styling element that vanished in a 2012 redesign. The current BMW 640i is powered by a 3-liter twin-turbocharged V6 that produces 315 horsepower and 330 pound-feet of torque.