2010 Ford Mustang SHELBY GT500. Forty-six thousand dollars is way too much to pay for a Ford Mustang, right? Not if said Mustang is the 540-horsepower, performance-tuned range-topping Shelby GT500. In this video, KBBâs Micah Muzio discusses the details of the Ford Mustang Shelby GT500, an American automotive icon and performance-car bargain. For more new car reviews, interviews and automotive news visit http://www.kbb.com today.