The BMW 3 series E90 is the currently available generation, which debuted for the 2006 model year, and is available as the sedan , wagon , coupe , and coupe cabriolet .The 3 seriesis completely re-engineered from the E46, including changes to engines, transmission, the passenger compartment, suspension technology, as well as a host of High-Tech features and options. The BMW 3 series coupé/cabriolet body is now its own design and no longer derived from the saloon minus two doors unlike its predecessors, being longer and narrower than its E90 counterpart. The lineup received a mid-generational facelift for the 2009 model year. Currently, four engine options are offered, two being part of the new 'N' series of BMW inline engines featuring a host of new technologies. Technological innovations such as lightweight magnesium/aluminum construction, electric water pump, Valvetronic , and Double-VANOS steplessly variable valve timing all contribute to produce a lighter and more powerful motor than its predecessor, but yield a 15% increase in fuel economy. The E90 also marks BMW's return to turbocharging with the introduction of the BMW 335. The N54 engine produces 300 bhp and 300 lb·ft torque. The BMW 3series convertible also marks another first for BMW -- a retractable hard top convertible. Sales of the 3 series have been very strong in Britain. In 2007, a record total of more than 58,000 vehicles were sold and it was the seventh most popular car in Britain.