Well, I just got back from the muffler shop because the exhaust system on my integra is rattling off the rear sway bar like crazy. They did not fix this because they said that my exhaust setup is illegal because I dont have a muffler. They quoted me about 230 dollars to add a magnaflow muffler to make it legal but I dont know what to do.

Do you think I should add a muffler? and if so, which kind? My exhaust is not extremely loud right now because there is a resonator on it but no muffler.
Or should I just get the rattle fixed and leave it straight piped for now?
Thanks