Cars in the CLS Class can seat up to four passengers and feature four-door designs despite the coupe character. The CLS550 comes with a 382-hp, 5.0-liter V8 engine teamed with a seven-speed automatic transmission. The much more aggressive CLS63 AMG has 507-hp, 5.5-liter, supercharged V8 under its hood and a five-speed automatic. Both models come with Mercedes-Benz's Pre-Safe system, which automates settings in the car for optimal safety. The sunroof closes automatically in an impending accident and seats move to the safest positions. More traditional safety features that come standard include side-curtain airbags and antilock brakes. For 2008, the CLS Class comes with more standard features.