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  1. EditorTurner

    1,200-Horsepower Shelby GT500 Build

    Big Game Pro Dyno pumps up John Antunes’ Shelby GT500 with a big-bore 6.2 By Steve Turner Photos courtesy of Pro Dyno If you weren’t a Mustang enthusiast, you might assume that a Shelby GT500 with a supercharged 5.4-liter engine would provide more than enough propulsion. We know better...

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