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The real questions are, how much power do you want to make and what is your budget. You start looking at heads, cams, forged bottom end (basically a completely new motor) its another $6000 or so on top of just cams, injectors, and a MAF. There are NPI specific blower cams out there that will get you another 75-100RWHP or so without any mods to the heads.
nick
i kind of like the idea of maybe npi specific cams, do you have any info on them. i am trying to be realistic with this upgrade, i am not looking for 450-500 rwhp. just looking for the upper 300's to 400 to the wheels if possible.
I don't have 6,000$ to play with, actually have my 3rd child on the way come november, i shouldn't even change it, but that's what we do.