Shelby GT500 Owner Buys Cheap Internet Tune, Grenades His $30,000 5.8L Engine

Not for one second during our Mustang Shelby GT500 review did we feel the need for extra muscle. And since the 5.8-liter Trinity is already blown when it leaves the factory, we considered that chapter closed. Unfortunately, we can’t say the same about the owner of the 2013 or 2014 Shelby GT500 in th…