Not unlike the X4, the X6 is a coupe version of the X5. Completely redesigned this year, it features much more meticulous lines. Unlike the X5, there’s no diesel engine offered. On the other hand, the 445-hp V8 engine is more fuel efficient than it was before, despite the 40 extra horses compared to last year’s version. However, the roofline that gives it its style may bother the passengers in the back seat as it limits headroom.