The 2014 Mercedes-Benz CLS 550 is a luxury "four-door coupe" powered by a robust 4.7-liter twin-turbo V8 engine that produces 402 horsepower and 443 lb-ft of torque. It delivers thrilling, effortless performance, rocketing from 0 to 60 mph in just 4.6 seconds while offering premium executive comforts