Yup, The first thing I did when I got my mustang was long tubes and Flowmasters. Six months later I get rearended and shoved my entire trunk up to the back window. I took it to the ford dealer on Bell rd to do the repairs and loaded the stock tune when I dropped it off just in case. A Month later when I picked it up I had forgotten that I loaded the stock tune and went to take off on bell to go home and she started to sputter, spit and backfire. I had to pull over in the next parking lot and reload my tune and it ran fine. The last option I have is to put all the stock componants back on the car but that will be a PITA and I shouldn't have to with this new tune. Now I'm being told that I may need to drive up to 300 miles before the computer unlocks and my regristration is due by tomorow.