I decided to start this thread because I consider myself a novice. I have a custom tune on my V8 Overland with a CAI and catback exhaust. I returned the vehicle to original back up and the car felt no different than with the tune on. I believe I felt a difference when I first got the tune installed but a couple of months later it feels the same. So I guess this brings me to my question. Is our ECU truly unlocked??? Can we see definitive long term results or does the ECU "learn" and cancels the tune if we're not stepping on it all the time?? I've seen conflicting threads in the forum!!! Can anyone with real knowledge on the issue chime in?? Any feedback is greatly appreciated!!!