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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 (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 300 bhp (224 kW; 304 PS) and 300 lb·ft (410 N·m) torque. The E90 series also marks another first for BMW—a retractable hardtop convertible. Sales of the E90 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 For the US market, the 2006 model year 325i and 330i are both powered by the same 3.0 Litre N52 engine, but the 330i features revised engine software and improved intake and exhaust systems to produce an additional 40 hp (255 vs. 215). The 2007 model year introduced the 3-series coupe and with it two updated engines for the new 328i and 335i models, which marked an increase in power over previous offerings and became available for the 3-series sedan as well. Canada also received a 323i sedan which has a detuned 2.5 L gasoline-injected inline-six producing 200 hp (149 kW); the 323i lacks features/options available to more expensive 3 Series models such as Xenon headlamps, fog lights, automatic climate control, and power-adjustable seats.
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