go 2 the rb20 turbo upgrade thread and go from there. it depends all about your budget. Basic Mods front mount intercooler, POD Filter( is your option though) fuel pump, dump pipe (which is from turbo back), front pipe (after the dump pipe), Racing Cat, Cat-back Exhaust (after the cat converter) RB25 ( From R33 Serious 1 or 2 R34 GTT). and remap ecu. dont think about boost too much boost will better running in 12psi in save area.
Im not too sure wat power will make but will be very close to wat u aim for.
Goog Luck
Mick