Honda generally builds their engines pretty well, and doesn’t leave a whole lot on the table in naturally aspirated applications. True, you can free up a little bit through simple things like intake and exhaust and a tune, but without going to forced induction, the only way to make power naturally aspirated is through displacement and revs. You might be able to pick up 10 hp or so, but without getting serious, that’s about all you’ll see. Don’t expect anything earth shattering, and you probably won’t be able to feel it seat of the pants.
Sorry to be a downer, but take this as fair warning before you put yourself into debt.
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