Originally posted by One Fast Cobra
Q: What about if I reverse the process and place back the stock tune before bringing the car to the dealer?
A: No, I will not be able to tell... The only thing that will show is the Calibration number. Other than that it doesn't say anything.
Q: Can a Ford inspector tell that the PCM has been reflashed?
A: No, all he would see is what I see and or what I tell him...
Again, the number of times the PCM has been flashed is stored. So loading your backup doesn't garauntee they wont find evidence of a reflash. This info came from both Nick @ Diablosport and Rick @ Amazon Racing.