Don't just change the turbo for something to do, run as much boost (1.0 Bar ) as you can, and wait till it dies, that way you will learn the art of drift before you get ahead of yourself and smash the car because you can't handle the power that all these described mods will give you.
I have Std Turbo, Cooler, HKS filter, Blitz BOV, T'Smart Boost Ctrl, Cat back Zorst and my car made 198.9 RWHP on 0.7 Bar boost
I think not bad...that's 148.8 RWKW I think (Correct me if I am wrong)