Starting in 2008, previous 2007 Shelby GT500 Mustangs could be sent to Carroll Shelby's Special Performance Plant in Las Vegas to be rebuilt into a "Super Snake", for an additional cost of $27,995. The Super Snake will offer a (at the engine) 5.4 L. A Kenne Bell twin-screw supercharged version with "over 725 hp" was also available, without warranty and offered a varied 0–60 mph acceleration time in 3.5 to 3.7 seconds. The Super Snake is inspired by the 1967 GT500 Super Snake, a car made by Carroll Shelby for Goodyear Tires.