This isn't your executive's 520d. While it looks more suited picking up high-ranking executives from posh hotels, the BMW M5 offers some serious performance. With a 4.4 liter, twin-turbocharged V8, the M5 puts out enough power to pin you to the seat, while offering reasonable amounts of comfort for a sport-oriented car. It's a delight to steer too. After all, it is still an M car.