The 2013 Shelby GT500 is the most powerful Ford Mustang. The DOHC 354.6-cubic-inch 32-valve V8 supercharged engine has been certified to produce 662 horsepower and 631 pound-feet of torque, and has a claimed top speed of 202 miles per hour. The '13 GT500 weighed 3,850 pounds and went on sale in May 2012. The 2013 GT500 features various improvements and differences compared to the 2012 GT500. The 2...More