The 3-Series is BMW’s entry-level model in the near-luxury segment, offered in sedan, coupe, convertible and wagon versions. A descendant of the mid-’60s BMW 1600, considered by many automotive enthusiasts to be the first compact sedan to offer sports-car performance, the 3-Series has continued to be the benchmark of sport sedans. The 3-Series designation first appeared in America in 1977, and the car evolved from a rather boxy shape to a fluid, aerodynamic design and the sedan and wagon now incorporate BMW’s new design language. The previous-generation 3-Series sedan was introduced as a 1999 model. The 3-Series Sedan and 3-Series Sports Wagon are redesigned and updated for the 2006 model year while the coupe and convertible carryover the 2005 styling for 2006. For 2007 a new line for the 3-Series joins the lineup available in three trims: 328i, 328xi and 335i. The first inline six-cylinder engine with twin-turbochargers, high precision fuel injection and an all-aluminum crankcase is introduced to the 335i that produces 300 horsepower.
http://autos.msn.com/research/vip/overview.aspx?year=2007&make=BMW&model=3-Series