I have an '02 wrx with stage 1 access ecu with hks grounding kit. I am looking for ways to tweak my car using the stock components. I've been told that the boost decreases after 5k rpm. So i've been a few things, adjust my stock wastegate so it holds boost longer. Buy an AVO wastegate which is designed for the wrx to hold boost upto 15psi longer. Buy a TurboXS Dual Boost Controller instead of the wastegate, price is about the same, the DBC has more adjustment/flexiblity then the aftermarket wastegate.
Now. I know the accessecu will allow for an uppipe, pulley and clutch. Will the AECU allow for a wastegate adjustment, wastegate or DBC without having known problems occur? if any?