The 2008 Mercedes-Benz CLS Class is comprised of the 5.5-liter Sedan or the 6.2-liter AMG Sedan. Both are four door luxury Sedans offering the finest in styling, handling and performance – attributes for which Mercedes-Benz has long been known. What’s even more interesting is the car’s Coupe-like stance, even with four doors. Two trim levels are offered in this class – the CLS550 or the CLS63 AMG. The CLS550 comes equipped with a 382 horsepower 5.5-liter V8 with 391 lbs.-ft of torque while the CLS63 AMG gets more oomph with its 507 horsepower 6.2-liter V8.