How do you make a 4,300-pound roadster accelerate to 60 miles per hour in under four seconds? Easy, just fit it with a twin-turbocharged 6.0-liter V12 that cranks out 621 horsepower and – wait for it – 738 pound-feet of torque. Sounds bonkers, right? Welcome to the 2013 Mercedes-Benz SL65 AMG. Funk Flex