2013 Ford Shelby GT500 convertible: The new Ford Shelby GT500 convertible makes its debut as the celebratory vehicle of the 20th anniversary of Ford’s Special Vehicle Team (SVT). The 2013 Shelby GT500 convertible with the optional Performance Package is nearly 3.5 seconds faster than the outgoing model at Sebring International Raceway. The 5.8-liter supercharged V8 with 650 horsepower, Bilstein electronic adjustable dampers and new Brembo brake system are key enablers for the improved performance. (02/08/12)