The Mercedes CLS Class changed the game forever, with its swoopy, aerodynamic styling and high-horsepower engines, the "four-seat coupe" became part of popular car culture across all marques. This 2007 model features the magnificient 6.2L engine, 7-speed gearbox, and was modified with an aftermarket tune and headers. As we learned, though, Mercedes had not quite figured out to do once the car hit redline. Still, an amazing value in the used market.