I had stage 2 for a while than removed it back to default after i got ticket.
In cold winter weather i hit car hard, car choked and than check engine came up. I went to subaru dealer so they can check it out.
They immediately came by after few minutes of diagnostic saying it got to much boost that is why check engine came up and also I'm running different code than it should be on the car so they asked me if i modified something.
I told them i had AP but i went to default after it.
I have a chance still to buy warranty on my 07 (less than 30k) but not sure if i want to spend 2k for warranty that may be void in the future.