The E90 is the currently available generation, which debuted as a sedan (E90) and wagon (E91) for the 2006 model year, coupe (E92) and cabriolet (E93) for the 2007 model year[citation needed]. It is completely re-engineered from the E46, including changes to engines, transmission, the passenger compartment, suspension technology, as well as the addition of a host of high-tech features and options. The coupé/cabriolet body is now its own design and no longer derived from the sedan (unlike its predecessors), and is slightly longer and narrower than its E90 counterpart. Major features include Comfort Access, bi-Xenon adaptive headlamps, Active Cruise Control and Active Steering. The sedan and wagon received a mid-generational facelift for the 2009 model year which comprised changes to the grille, headlights, taillights and trunk. The coupe and cabriolet are expected to be refreshed in the 2011 model year.
Currently, twelve 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 (steplessly variable valve lift), and Double-VANOS steplessly variable valve timing 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 306 PS (225 kW; 302 bhp) and 400 N·m (295 lb·ft) torque.
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