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Colt cam regrind, header (if you can find one), exhaust, higher compression pistons. I have heard rumors of people swapping the stock carbs out for webers, but that's not confirmed.
There is very little aftermarket support for the Si, and even less for the S. You will need to be creative to upgrade the single bumpstick 3rd gen. And preludepower.com definitely has a lot more activity for 3rd geners.
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