When the BMW X5 M debuted for the 2010 model year, it set the standards for what a performance-oriented SUV can accomplish. Now, the high-performance SUV and its coupe-like sibling, the X6 M, are undergoing a second makeover to further boost performance, fuel economy, and overall curb appeal. Both the X5 M and X6 M will receive identical performance modifications for 2015. Under the hood is a 4.4-liter turbocharged direct-and injected V-8 engine that produces 567 hp, which is just a 3-percent increase from the previous model year. The real news is a 53-lb-ft increase in torque for a total of 553 lb-ft. Also improving performance is a new eight-speed M Steptronic transmission, replacing the old six-speed. This new tranny behaves similarly to the M Double Clutch transmission used in other M models, providing rapid gear changes and increased fuel economy. All these enhancements make the new models much faster. Getting these midsize utility vehicles from 0-60 mph now only takes 4.0 se...
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