Watch Extreme Mustang: Back to the Track (1970) : Full Movie Online Free Engineers from Ford Racing and motor sport company Multimatic join forces to transform a street-legal Mustang into a high-performance track racer in this dynamic documentary for car lovers. Follow the action from the design phase through the meticulous tweaking of the supercharged pony car until it's ready to take to the track. NASCAR star Kurt Busch test-drives the mean machine once it's been converted into the ultimate gearhead fantasy car.