After seeing tons, and i mean tons, of threads on this subject I decided to make this sticky. For the past year there has been a pair of tech articles on this very forum telling you two distinct ways to go about it. There are two articles on vfaq.com on how to do it, and yet i still see 2-3 threads a month on this very topic. Hopefully this will help limit those threads.
If you want to do it really cheap and just bolt on some turbo parts to your nt motor, this thread will tell you exactly what you need to know.
The 4G63 NT Engine, and How to make a turbo kit for it!
If you're thinking you'd rather install a full turbo motor with wiring harness and other essentials, then this is the thread for you.
Installing a turbo 4g63 into an nt 4g63