BMW X5 M is powered by a tuned up 4.4 liter V8 M engine delivering 555 horsepower at 6,000 rpm and 500 lb-ft of torque from 1,500 to 5,650 rpm. Top speed is limited to 155 mph and runs 0-60 mph in 4.3 seconds. The Audi Q7 V12 TDI was developed by Audis Quattro GmbH high-performance division. The crossover is capable of hitting 62 mph in 5.5 seconds, with a limited top speed of 155 mph.