Try disconnecting your wastegate on your stock turbo, you will for sure pick up some power. Mine on my Ex. is disconnected and runs like a champ.
The only other issue you will have doing this, is you will need something to fool the MAP sensor into not tripping the SES light. There are vendors o' plenty here that have just what you need.
Watch your EGT's as well, if you don't have an EGT gauge, I wouldn't risk it.