Why are we talking FI I though that wasn't a consideration, people can discuss reliability of FI for hundreds of pages, but that's not the point here.
Cams, pulley, and a change to e85 would be the only real things left for NA top power. Manifold will increase power band in the mid rpms but not effect top. Very few (2 I think) have done cams, so you'll be mostly on your own with that upgrade.
If you're looking to go fast quickly there are three aspects not just power (often the most expensive aspect). Power, weight, and traction all make you go, too much or too little of one will mess the whole thing up.
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