A prototype of the 200 mph 2013 Ford Mustang Shelby GT500 sold at the Barrett-Jackson auction in Scottsdale this past weekend for $300,000. Used to develop the upcoming muscle car's 650 hp supercharged 5.8-liter V8, the mule was originally built in 2007 and modified with the new motor to put it through a full slate of endurance testing, including a ... (more)
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