A four-passenger luxury sports sedan, the 2010 Mercedes-Benz CLS-Class has four doors but is styled to look more like a coupe. The CLS-Class is offered in two extremely well-equipped trims; the CLS550 and the CLS63 AMG. The CLS550 is powered by a 382 hp 5.5L V8 while the AMG version receives a 501 hp 6.3L V8. Both engines utilize a smooth seven-speed automatic. The 2010 CLS-Class now comes standard with HD Radio.