The 550 sedan seats five passengers in its leatherette and wood trimmed interior. It provides luxurious accommodations like a 10-speaker twin subwoofer sound system and rain-sensing wipers. It is powered by a 360 hp 4.8-liter V-8. It can be equipped with a six-speed manual or automatic transmission with Steptronic. With the automatic there are manual and sport modes. Safety features include antilock brakes, tire-pressure monitor, dynamic stability control, side-, curtain-, and front-airbags.For 2006, the BMW 550 gets a power upgrade and all-wheel drive is available.