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I went through this development cycle with my old MR2, and here's what I found.
Intake, slight improvement in throttle response, not really HP. Sounds great.
Exhaust, sound improvement.
Gutted cat - loss in low end, but increase in mid and high end HP.
Port/polish head + high lift cams - lots of power increase, all RPM's, but believed to be heavily influenced by previous mods.
Its all about opening up the airflow, and there exisits a STRONG relationship between intake and exhaust flow - without head restrictions
If I had to pick one as being predominant, I would say head work/cams.
But remember, what you gain in power, you usually loose in "street-ability" - funky, unpredicatable behavior,
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