Personally i havent, but i know a guy that went in because his high pressure fuel pump went out, so he downloaded the stock file, loaded it on a roll back, and right to the dealer, he put the dpf back on but left the dpf back exhaust and the intake, the dealer had an idea what was going on but they couldnt prove anything, they put the fuel pump on and away he went. There are others i have heard of too but that is the best example i have.