We didn't get to the history but they were willing to honor warranty so as long the car can be re-flash back to stock form (even with DP) to perform diagnosis to determine the caused and effect. I probably won't be doing anything beyond stage 2. My main focus is upgrading my suspension & brakes. One thing they said interesting is won't do is an install DP. But once it's on the car, they won't ask you to take it off.