Ok, So you wil need a bigger fuel pump or a 2nd wal-fail
3" exhaust will be starting to hold you back at this point, so look into a 3.5"
But something is not right for a turbo that size to be at 20psi and only be making 314rwkws
For eg, 20psi using a Gt35R would be making 340-350rwkws on a DD dyno
Oh and before some noob says he should run 98 octane fuel, the YANK 93 MON fuel would be like our 100 RON