Here's a good read on the subject. This person is using UTEC, instead of an AP, but same principals. One issue is, if the car has an issue and you drive it at WOT, it will still boost to what the MBC is set to. It would bypass going into limp mode, at WOT. Other than that, as it mentions, it can be a good set up. Just have to be cautious
http://forums.nasioc.com/forums/showthread.php?t=602674