“Whoa—it’s like a fighter plane in here!” said one of my neighbors. Well, it’s like that behind the wheel, too. AMG is Mercedes-Benz’s tuner division, the skunkworks where mad scientists take ordinary high-performance Mercs and turn them into extraordinary higher-performance Mercs. This one, for example, is armed with a 4.0-liter twin-turbocharged and electrically boosted V-8 that can churn out 603 horsepower and 627 pound-feet of torque