The 2006 BMW 6 Series is part of the second generation of the premium luxury range. Coming in as either a coupe (645Ci) or a convertible (650i), these cars are fitted with an exceptional 4.8-liter V8 engine delivering 360 horsepower, matched with either a 6-speed manual, automatic or SMG transmission. An M6 model is also available, featuring a 5.0L V10 engine with a whopping 500 horsepower. The 6 Series exhibits truly luxurious features such as a premium sound system, leather upholstery, and navigation. An iDrive infotainment system, although somewhat complex, offers intelligent technology. Safety features include stability control and multiple airbags. Notably, the 650i replaced the 645Ci mid-year, providing a slight performance upgrade.