In theory, you can use whatever parts you want, if you know how to make it all work together. Since there's no kit, and only like 4 people have turbo'd their GT (all in completely different ways, I might add), there's no right or wrong way, or set parts list. I too have been planning a turbo build, and I'm hoping to maybe get started this summer, if not next spring. You just need to do a lot of research and see what parts work well together, and decide what direction you want to go. There's just so many variables to take into consideration.
MODS: Toilet paper tube intake - Coffee can muffler - Cell phone mount - WalMart LEDs