car will run fineish under 5,000rpm i.e before you hit boost
if you want to putt it round to the tuners it should be fine just keep it off boost and make sure you still have stock fuel pressure on the reg
and not way under or something stupid
ps t04e will suck the wang if your only gonna be running 10-12psi you must have low power hopes i.e under or around 200rwkw
why not just go a vg30 turbo or a rb25 they will be much nicer to drive and still make or get close to the power you want