The 2010 BMW X6 M is the same in many respects as the 2010 BMW X6, but it substitutes a brawny 555-horsepower, twin-turbo V-8 for the naturally aspirated six- or eight-cylinder engines (or hybrid powertrain) that are included in the X6. It has standard all-wheel drive along with a list of upgrades that make it fit for weekend track outings. Acceleration from 0-60 mph happens in about 4.5 seconds.
Just as like the X6, the 2010 BMW X6 M is a bit of an oddball, combining a coupe-like profile with SUV-like dimensions as well as SUV heft. The overall shape is aerodynamic and flowing above the shoulder line, but below, its bulk throws it off-balance. The X6 M is more aggressively styled than the X6, and rides on huge 20-inch wheels, while on the inside some might find the X6 M's carbon-fiber-look panels a bit much.
The curvy profile has its drawbacks—namely, compromised back-seat space and limited cargo space. The back seat is only good for two. But no features are omitted in the X6 M; it's completely loaded, with upgraded sport seats, supple leather, and extras like dynamic cruise control.
For more, see the 2010 BMW X6 review, which covers areas such as features and safety in depth and includes specs, pictures, and related news.