As Ahad paaji said, you're talking of a civic here.
S2000 has a pretty sweet stock exhaust note to begin with, so to obtain a good sound from that engine is just a matter of slapping on a new resonator and a catback. With the Civic, you'd need to find a good enough resonator to make your car sound "good" and unlike a fat man farting, which is the sound we mostly hear from Civics in Pakistan.
I'm guessing you'd need a resonator, and a 2 or a 2.25 inch diameter catback exhaust. 2.5 would be unbearable and would make your car "pass wind"