I just reflashed my 06 this morning to stage 1. When I put the car into test mode the fan went on and off and the cel light flashed. I looked in the book and this is all normal. But I didnt ever notice this on my 02 wrx when I reflashed it. And I did it a few times....from stock to stage 1 then to stage 2 and then again to stage 2 when they upgraded my ECU on warranty then back to stock again. And never once to I remember it doing the same thing as my 06 did. And my 02 flashed fine every time. So unless Im mistaken about my 02 not doing that....then I think it will work.