Steeda Shelby GT500 600+hp
The "Super Snake" upgrades, an effort by Shelby Automobiles and Ford Racing, feature kits that jack up the output of the 5.4-liter V8 to 600 hp while retaining the factory engine warranty, and a non-warranty version that makes 725 horses. Steeda matches the base "Super Snake" kit with engine modifications ...
http://www.mustangv8.com/en2/modules/wordpress/2007/05/16/steeda-shelby-gt500-600hp/
