Based on the 5 Series, this sleek grand tourer comes as a two-door coupe or convertible, as well as the four-door Gran Coupe version. Power comes from a 3.0-liter, turbocharged six-cylinder or a 4.4-liter V8, mated to either an eight-speed automatic or a seven-speed automated manual in the M6. The V8 delivers ferocious acceleration and an invigorating exhaust note. Handling is much sharper than the 5 Series, making the big coupe more of a driver's car than its progenitor. The M version is even more performance-oriented. It's quick, capable, and enjoyable to drive.