Haven't seen any in competition or any that looked good. I did see one outside Scheids shop one day, looked terrible, HUGE hole in the hood, like 2 foot square. Maybe if you did it like some of the newer trucks do, have a stack bolted to the hood, and when the hood is open, it disconnects from the stack at the turbo. When closed, it sorta closes over the stack at the turbo or just above the turbo. Follow me. That way you wouldn't have to have a huge hole in the hood for it to open.