It takes a combination of parts to make horsepower. Not just the correct size turbo. Turbos dont make cars fast. good setups do. One poorly chosen part can turn a 500whp car into a 425hp car. I asked what your budget for the build up is so we could help you design a setup within your budget. I have been building the 4g63 for about 12 years now. I have seen many setups good and bad. most bad. it takes a lot of experience to build an impressive setup. The best way to do it is know how much you have to spend and then maximize the setup within that budget.
what we need to know is what car you have.
how it runs now and what parts it already has.
what fuel you want to make power on.
and your intended use of the car.
and of course how much you have to spend on the project.