BMW's twin-turbo, 3.0-liter inline-six is turning out to be as exciting an engine as the automaker's lauded 5.0-liter V10. Though its horsepower rating is down a couple hundie compared to the V10, the experience of dropping the hammer on a perfectly balanced inline-six that's sucking in more air than a Dyson upright is awesome (or so we've heard). The engine debuted in the 3-Series Coupe, followed by an appearance in the 3-Series Sedan, and finally we've learned when it will be taking up residence in the all-wheel drive 3-Series Sedan. The vehicle, known as the 335xi, will be available in March of 2007 according to this page on BMW's Military sales website. With 300 horsepower, all-wheel drive and BMW handling, the 335xi promises to be everything to everyone.