On this episode of Ignition, Carlos Lago tests Mercedes-Benz CLS63 AMG S-Model. Mercedes calls it a coupe, despite the fact that it has four doors, but what really matters is underneath the sheet metal: A 5.5-liter twin-turbo V-8 that sends 577 horsepower and 590 lb-ft of torque to all four tires. Its performance will be exceptional, but will the styling be enough to warrant the extra cost over the E-Class on which the CLS is based? This week, we find out. Ignition appears every Monday on the Motor Trend youtube channel. http://www.youtube.com/motortrend Subscribe now to make sure you're in on all the action! http://www.youtube.com/subscription_center?add_user=motortrend Facebook - http://facebook.com/motortrendmag Twitter - http://twitter.com/motortrend Google+ - https://plus.google.com/1018679678590... Website - http://www.motortrend.com