Well I have just fitted a stage 4 snort kit to a completely stock ea. this was with a a/a cooler and a rising rate reg.
i backed off the dizzy a bit to stop pinging, with std pump and std inj ( inj were cleaned and new fuel filter fitted)
and left the wastegate set at 8-9 psi.
So far it has made 205 rw kw, with a free flowing exhaust.
gonna fit an intercepter and an extra pump shortly, gonna aim for 250 with a bit more boost !