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When Shelby first launched the GT500 Super Snake in 2007 (or relaunched, if you consider the one-off 1967 prototype), the 5.4-liter supercharged V8 was boosted all the way up to... wait for it... 600 horsepower. Fast-forward just five years and the muscle car landscape looks quite different. The 2013 Shelby GT500 now comes with 662 tire-shredding horsepower from the factory.