Yeah i would stay far away from Hennessey if I was anyone considering building my car. I know of many horror stories of cars sitting at his shop for months on end with nothing done, engines blowing up after only a few hundred miles of highway driving, and paying for parts and upgrades that were never put on the car. If any of you are seriously interested in upgrading your challenger/charger/etc... and live in Georgia or close to Georgia there is an amazing shop about an hour outside atlanta.