2015 Mustang gets 600HP+ supercharger boost

If there's one thing we didn't doubt about the 2015 Ford Mustang when we drove it in September it was its power, but since there's probably no such thing as too many horses, now there's an officially-sanctioned supercharger upgrade for the muscle car. Co-developed by Ford Racing and notorious pony-fettlers Roush Performance, the kit pushes the 2015 Mustang GT to …