The twin-turbocharged, MULTIPLE PERSONALITY: ‘21 BMW M5 COMPETITION can be a comfortable family sedan. Or it can be a very fast four-seat sedan with all-wheel-drive to safely play, or go out Supercar hunting, blogs Dan Scanlan. I had to double check the numbers. First, our 4,345-pound M5 Competition boasted 617 horsepower and 553 pound-feet of torque, with all-wheel-drive and launch control. The 4,600-mile-old sedan hit 60 mph in a hair over 3 seconds, and 100 mph in 7 – check out the v...