The Venom 1000 Ford Mustang GT500, upgraded to 1000 HP by Hennessey Performance, is a highly modified version of the already impressive Ford Mustang GT500, designed to deliver even more power and performance. In this comparison video against a stock version of the Mustang GT500, the differences are noticeable. How does this champion of American muscle stack up when placed next to a stock version? The Venom 1000 Mustang GT500 lined up against a stock version on the Pennzoil Proving Ground to see what happens.