2 things I don't enjoy doing is exhaust work and looking for suspension/drive train noises! Great job finding it and it looks like you deal with a lot of vehicle rust too.
I just bought a 2009 cobalt. Same noise after two days of having it. It’s getting worse by the day. I’m taking it tomorrow to be looked at and fixed. If this is for sure the issue how much should I expect it to be for parts and labor? I’m in kentucky if that makes any difference