To know why Mercedes-Benz calls the 2007 S65 AMG the “world’s quickest four-door,” you must know just two important figures: 604 horsepower and 738 lb.-ft. of torque. With it’s hand-built, twin-turbocharged, 6.0-liter V12 engine firing under its hood, the S65 AMG shoots from rest to 60 mph just half a click slower than a Corvette Z06, at 4.2 seconds. The sad thing is, most S65 AMG buyers will want it because it’s the most expensive S-Class on the line, and not because they actually plan to drive the thing.