Watch a review, a comparison test and a drag race between the high-performance diesel BMW X5 M50d and the petrol-powered 2014 Range Rover Sport. The 2014 Range Rover Sport is powered by a 5.0-liter V8 powertrain that's good for 503 bhp. The X5 M50d Bimmer comes with a 3.0-liter 6-cylinder in-line engine that develops 381 hp and 740 Nm of torque.