The monstrous V-10 engine residing under the 2006 BMW M5’s hood is capable of producing 500 horsepower and 383 lb.-ft. of torque. Weighing in at a tick over 4,000 pounds, the M5 isn’t exactly a lightweight, but it can still reach 60 mph from a standing start in just 4.5 seconds. Not long ago acceleration like that was reserved for lightweight exotics sporting 12-cylinder powerplants with turbos or superchargers. The BMW M5’s quickness can also be attributed to the Sequential Manual Gearbox transmission. Top speed is electronically limited to just 155 mph.