With the 2014 BMW M5 arriving this summer, Autoweek decided to take a look at five generations of the M5. Equipped with the new Competition Package, the latest incarnation has a twin-turbo 4.4 liter V8 pushing 575 hp and 500 kb-ft of torque. That is a small gain over the original E28 M5, powered by a 252 hp 3.5 liter inline 6. Autoweek thinks the newest one is the best yet. Which is your favorite?
