Home Sixth Gen Mustang 2015 Ford Mustang Hennessey Performance built a 717 horsepower 2015 Mustang GT to rival the Hellcat and Z06 Corvette. The HPE700 upgrade will propel the base 2015 Mustang GT to 60 mph in 3.6 seconds and run the quarter-mile in 11.2-seconds at 131 mph.