The 2013 Shelby GT500 came at a time when the horsepower wars continue to go crazy. The Chevy ZL1 Camaro had 580 horsepower so SVT engineers set a goal to get the GT500 to at least 650-horsepower. This would have made the new GT500 the most powerful Mustang to ever grace the streets. Shelby and Ford SVT engineers went to work and came out with astonishing 662 horsepower and a car capable of a top speed exceeding 200 mph. For context, that is more than 100 horsepower more than the prior year Shelby GT500.