Jay Leno reviews the latest generation 2013 Ford Shelby GT500. He also presents the new Mustang Boss 302. The new Shelby GT500 (2013) comes with various improvements in comparison to its predecessor. It has a new 5.8-liter V8 engine, which is more efficient, even though it outputs 650 hp and 600 lb.-ft. of torque. It also comes with a Torsen limited-slip differential and a launch control function.