Just remove the piggy back or Cobb before you go in for warranty work. I doubt they have the capability of reading how often your car is flashed. Interesting note...GIAC told me my car was flashed twice before they flashed my car. They doubt the dealer (and I assume Carmax) has this capability. At least I was never told by my dealer the car has been flashed, even when I had my 135 with Cobb.