The 550i is powered by a 360-hp 4.8-liter V8 and comes standard with Dakota leather upholstery, ambient interior lighting package, auto-dimming and outside approach lighting, park distance control parking assist and a choice of the manual, SMG or automatic transmission at no charge. Safety features that come standard include front airbags with dual threshold deployment, front-passenger side airbags, and full-cabin curtain-style head-protection airbags. Rear passenger side-impact airbags are optional.The BMW 550 is largely a carryover from 2006. The only additions are an auxiliary audio input and a tire pressure monitoring system.