BMW's high-performance M3 features V-8 power and is available as a coupe, sedan or convertible. The serves the most powerful version of 3 Series, with 414-horsepower, 4.0-liter V-8, six-speed manual transmission aggressive styling that's common to M cars. Competition includes Mercedes-Benz C63 AMG, Lexus IS-F Chevrolet Corvette.