I've got a 4.0 Whipple supercharger that was installed on my GT a few years ago. It's got less than 500 miles on it. My car is not registered, I don't really drive it. A couple times a year I'll print out a 3 day temp tag to drive it a few miles around town. I have trailered it to two half mile events. Otherwise the setup is brand new. I'm probably going to do a Heffner Twin Turbo next month. Anyone want this complete kit? Make an offer. It made 761rwhp in 108 degree heat on bone stock motor with Ford Racing muffler and cats still installed.