The 2010 X6 M enters the realm of high-performance luxury midsize SUVs with a bang. In fact, neither of its two leading competitors -- the 2010 Mercedes-Benz ML63 AMG and 2010 Porsche Cayenne Turbo S -- can match its power output or quick acceleration time. The Cayenne, however, comes close with 550-horsepower and a 0 to 60 mph time of 4.7 seconds. And whereas the 2010 BMW X6 M and ML63 AMG have their top speed limited to 155 mph, the Cayenne Turbo S maxes out at 174 mph. All three, however, are magnificent performers.
the BMW X6 M is all new for 2010
