Mine was an N/A with a 2.25" cat-back to 3" Cannon. It might of had a high flow cat as well but I don't know. Lets just say I just found out a few days ago it is very much illegal! 90+db at test RPM and 100+ on backdown. But whack the silencer in it and all is good. I never realized how loud it was until I sold it. So for sound just whack on a cannon. It is Jap so it ain't out of place.
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