A few years ago, BMW split its 3 Series in two. The sedan and wagon remain part of the 3 Series, while the coupe and cabriolet are now part of the 4 Series. However, just to make sure everyone is good and confused, the 4 Series also includes a hatchback called Gran Coupé. The base engine is a 2.0-litre four-cylinder developing 248 horsepower. At the other end of the spectrum, the M4 is equipped with the M3's engine and relies on its 425 horsepower to get it from A to B—very quickly.