[SailorJ]

Thanks for all of the responses! I will keep y'all updated on what I find if anything. Yesterday I rigged my exhaust back together temporarily and didn't hear anything! I tack welded and used some metal tape to seal where I had cut it and once the metal tape blew off... there was the knock again. It's weird because the first time I heard the knock the exhaust was unmolested. I'm stumped. Also had a neighbor today lend a hand with a mechanic's stethoscope and he didn't have any luck either. Maybe I'll have some news here in the next couple of weeks. Thanks again!