catalunya199again

quite simply im looking for 1 last remap as im quite happy with what i have and dont want a fmic im running 320bhp and 313lbs on 21 psi, i now have a wrx02 short engine after mine went bang so i know its better than my old uk engine. what i have

wrx 02 short engine
apexi ecu
wrx02 tmic with alcohol injection
full stainless exhaust (heat wrapped downpipe)
td05 fe ported and polished
headers and up pipe heat wrapped
walbro fuel pump
fse fuel reg
440 inj
itg panel filter
exedy clutch
full samco hoseing

i think thats it

i was thinking of getting a 3 port solenoid and maybe and induction kit but thats it what could i realistically being looking at i heard i could run about 23 psi is that possible or to high for what i have