The Mercedes-Benz CLS63 AMG is a performance version of the luxury four-door coupe, the Mercedes-Benz CLS-Class. It is powered by a hand-built 5.5-liter twin-turbo V8 engine that produces 550-590 horsepower. The CLS63 AMG boasts impressive performance, with a 0-60 mph time of 4.3 seconds, and a top speed of 155 mph. It also features a 7-speed AMG Speedshift MCT transmission, specially tuned suspension, and a number of luxury features.