You're asking a question that's little bit too general and broad.
It all really depends on what kind of turbo set up you're getting.
Of course, bigger turbo, more power, etc.
It all matters on your ECU and tune up setting as well.
After all, your best bet is to go to online forums for Celica in your generation.
Do lots of research, because you're not spending small amount of money.
I would say with investment of 4k, you're gonna get around 350whp.
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