Mercedes-Benz's flagship S-Class was redesigned for 2007 and continues largely unchanged for the new model year. For 2008, the S63 AMG - another high-performance AMG model joins the S-Class lineup, which already includes S65 AMG, S550 and S600. Rear-wheel drive models are offered, along with one that has Mercedes' 4Matic all-wheel drive. Satellite radio is the new additional feature for 2008.