I don't know where I heard it but I was told if the battery was disconnected that the ecu would revert back to stock. When I got my car back my clock was off, radio stations all reset, and I was only making stock boost(I got a boost gauge) and it was noticably less power. So whatever they did they made it stock again, that I'm sure of, I even popped a code on the way home before I reflashed it stage 2. When I did reflash it stage 2 it was back to the way it was, which was running good, but about every week or so I pop that same code(bank 1 too lean). I don't have the stock intake, I use the K&N short ram intake. The thing thats strange, is it started doing this after getting it back from Subaru, I had no problems while stage 2 before the dealership. One of my buddies said I could have a blown intake valve, I sure hope not, it seems to run fine. I don't know??