New turbo would be the way to go to get there. That little td04 won't get it there. Up-pipes are already not catted and the intake would be fine. My friend has around 300whp on his vf39 and it spools pretty fast but you will need more fuel(injector and pump) and a good real tune.
Is there any particular racing you do example: drag, autox, track, or fun for street?