Originally Posted by Unabomber
Based on your questions which prove you are months away from having the proper knowledge base to safely upgrade, I vote you just swap out with a newer stock turbo and continue to research for down the road.
This is the best advice. OP you obviously don't have even the basic understanding of what this car needs to function properly. I'm not trying to be a dick, just realistic. There are literally thousands of pages here on this forum that you can use to educate yourself on anything from brakes to coilovers, and turbos to intercoolers. A good place to start is by reading the manifesto on the newbie forum (it's a sticky on the top). Even though some of the information is a little dated, it's still a valid source of good information about the cars. After that if you start having more specific questions you'll want to search the approiate forums. If after all that you cannot find your answer then post up a question.