http://www.roadandtrack.com/new-cars/videos/a25836/hennessey-mustang-breaks-200-mph/ http://www.roadandtrack.com/new-cars/videos/a25836/hennessey... The modifi

http://www.roadandtrack.com/new-cars/videos/a25836/hennessey-mustang-breaks-200-mph/ http://www.roadandtrack.com/new-cars/videos/a25836/hennessey... The modifications were basically throw boost and fuel at it until it makes 775 hp.