I'm wondering if anyone has any experience with something like this. When I bought my car, it had a Q300 full turbo back, and was not throwing any codes. I suspected it had been tuned but I did not know for sure. When I bought my access port, my suspicions were confirmed, and my access port had to unmarry the former one. Well, I am selling the car, and I am curious if I uninstall my access port, will it revert back to a stock tune, or will it revert back to the tune that was on it from the previous access port?