The S55AMG seats up to five occupants in it's full-leather interior. Other standard features include: a navigation system, heated power seats, and a Bose audio system. It is powered by a 493-hp, supercharged 5.5-liter V-8 mated to a five-speed automatic. Safety features include side-impact airbags, side-curtain airbags, and an electric stability program that is comprised of traction control with lateral skid-control.For 2006, the Mercedes-Benz S-Class receives a 4Matic all-wheel drive and an AMG Sport Package as no-cost options for certain models. Other minor amenities change for different models.