Well NOS and possibly a Turbo are always valid ideas when you're looking for big gains fast.
If you're planning on staying N/A for now and want to harness the potential of the 4G64.. then I would suggest the Stage 1 Performance Kit from these guys...Here
That's the route I am pretty much taking although I am buying things one at a time and not all from the same place and whatnot. There is a website for RPW performance that has great ideas on it but I don't have the link..
oh wait here it is... RPW
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