Recently BMWBLOG has learned that the upcoming 2015 BMW X5 M and X6 M will feature an updated V8 4.4 liter turbocharged engine that will produce more power than the current version. While our sources have not indicated the exact output, they mentioned that the new powerplant is more than just a tuned up version of the S63Tu unit with the latest engine developments from BMW.
Rumors around the interwebs say that the new powerplant will produce nearly 600 horsepower, a significant upgrade even over the Competition Package developed for the M5 and M6. The torque will also get a bump well above the 500 lb-ft limit.
The top speed will likely be electronically limited to 174 mph (300 km/h).
Official debut of the F16 X6 will be this summer in Moscow, most likely followed this fall by the X5 M and X6 M.