So apparently Hennessy is trying to compete with the hellcats. Sell modded mustangs with 717hp.
http://jalopnik.com/hennessey-will-build-a-717-hp-ford-mustang-for-the-pric-1641152563
http://jalopnik.com/hennessey-will-build-a-717-hp-ford-mustang-for-the-pric-1641152563