The Mercedes-Benz AMG CLS 63 is a high-performance version of the Mercedes-Benz CLS-Class four-door coupe. It was produced between 2007 and 2014 and featured a powerful V8 engine and a variety of custom performance upgrades. The AMG CLS 63 had a 5.5-litre V8 engine that produced up to 525 horsepower, allowing it to reach a top speed of 155 mph. Other performance upgrades included an adjustable suspension, racing brakes, and a sport exhaust system.