Well update again. The noise is almost gone completely. Once it got hot and I got on it a little bit just a few times... nothing over about 4k, the sound could barely be heard. I got onto a road with guardrails where I can always hear the sound... nothing though. I got home where there is a huge concrete wall and no sound. Later yesterday I started it up and there was just a very faint sound, maybe because the car had cooled off for a few hours. Either way though... not anything I expect to be an issue. For all I know when I tightened down the bolts a very small piece of rust or anything could have come lose and gotten into the ART pipe? I don't know. Anyway, getting better, more broken in and maybe a little more power? Could be in my head there though lol.
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