Well your wrong. Boost is controlled by the right foot. Im running a rb20 highflow on mine and its a simple matter of keeping off wot to control how much boost is made.
I can put my foot down and run whatever i want ie, my ebc is set to 16psi, but i cant run that much as my coil packs are shagged, so i can go say 1/2 down on throttle to get to 0.5 bar which will still pull to redline.
I agree with cubes, choose the turbo to suit the power u want, not just get a gt35r (or larger) cos thats whats recommended on a 3lt motor.