According to the German brand, the X6 isn't an SUV, but a Sports Activity Coupé, which says a lot about its style and purpose. The X6 shares many of its components with the X5, but with more dynamic styling and sportier driving characteristics. In addition to the turbo inline-six (300 hp) and twin-turbo V8 (445 hp), the range-topping X6 M gets a 567-hp twin-turbo V8 and a sport suspension.