The GT350 was a post-title upgrade available from Shelby. Customers could have their 2011 Mustangs shipped directly to Shelby's Las Vegas facility to be converted or they could deliver the car themselves. Automatic transmission was available for conversion with a naturally aspirated engine, producing up to , and manual transmission cars had the option of NA or a supercharged engine fitted with a Ford Racing supercharger to produce , or at the expense of the warranty, , a Ford Racing suspension system (The first 100 cars were fitted with the Eibach suspension carried over from the GT500 Supersnake), Baer brakes in front and optional in rear, Custom Borla exhaust system, 19" Cragar wheels, and more. For the exterior, Shelby installed a new front fascia, front splitter, functional hood scoop, functional brake cooling ducts, tail light trim, rear deck lid filler panel, and a rear fascia with center exhaust exit. Performance White with Guardsman Blue racing stripes were the only available color combination for 2011 models. 2012 models were available in other colors, but lost the 45th Anniversary badge of the 2011.