The high-performance BMW X5 M was launched for the 2010 model year, four years into the SUV’s second-generation model and 10 years since the midsize, luxury SUV made its global debut. Compared to its less insane sibling, the X5 M received a more aggressive exterior, a host of bespoke interior features a more powerful engine. While the X5’s 4.4-liter V-8 was rated at 400 ponies, the X5 M’s delivered an astounding 555 horsepower and 500 pound-feet of torque, making it one of the most powerful SUVs in production. The X5 M was impressively fast, needing only 4.5 seconds to hit 60 mph from a standing start. As we venture into the 2015 model year, the X5 M is receiving the same exterior and interior updates as the facelifted X5, plus a few additional ponies to its tried-and-true eight-banger.