The 2006 Mercedes-Benz S-Class is part of the fourth generation of the brand's flagship luxury sedan. Available in four trims: S350, S430, S500, and the high-performance S55 AMG, the S-Class offers a range of engines from a 3.7L V6 in the S350 (241 hp) to a supercharged 5.5L V8 in the S55 AMG (493 hp). All models feature a seven-speed automatic transmission and rear-wheel drive, with all-wheel drive optional on the S430 and S500. Notable features for this model year include an upgraded COMAND infotainment system, bi-xenon headlights, and adaptive braking technology. Safety features include stability control, side airbags, and Mercedes-Benz's 'PreSafe' system, which tightens seatbelts and closes windows when a collision is imminent.