Per the cyclinder size definition, you could run up to a 3.4" exhaust and not be ricey lol. It is loud, and when the OP gets tired of it, its an easy change to add a muffler at the straight section of exhaust. It's tough to not have a honda sound, similar displacement, front intake aft exhaust layout (k-series), the two motors have a lot in common.
At least it sounds better than a race prepped miata ;)
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