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I'm glad you found the culprit, and it seems like an easy fix, but you need to ask the question "why did it happen?" it seems like one or more of the exhaust hangers is bent, thus causing it rub into the bolt. You will find yourself doing this repair again if you don't deal with the cause. Sorry to harsh your victory.
A hole in the exhaust pipe, likely caused over the weekend while I was hauling that big work trailer a thousand miles, moving my family. You can see that screw must have punctured it. I'm sure glad it's nothing more than a hole, it seems. I think I can have a welding shop fix that for cheap.
Found the solution on an EricTheCarGuy YouTube video on identifying exhaust leaks. Love that guy. Took me literally one minute to find the hole.