After selling some 20,000 units of the X6 M in just five years, BMW is introducing a new generation of its premium Sports Activity Vehicle. Under the hood is an M Twin Power Turbo engine with 4.4 liters of cubic capacity and eight cylinders. Boasting 575 horsepower and 750 Newton meters of torque, it sends the car flying from 0 to 100 kilometers an hour in just 4.2 seconds -- a full half second less than its predecessor.