I found some clothing to act as padding and put it down the length of the downpipe back to the cat. A quick 30 second test yeilded promising results as I no longer heard most of the noises. I then removed the clothing and tested the car, and I still couldn't get the noises back... so I don't really know.
When I was installing the clothing, I did notice there was a thin little bar at the bottom that was very close to the exhaust... closer than I had noticed when checking yesterday.
I'm going to dig around for some stiffer exhaust mounts and order them. Hopefully that's all the problem is.
Thanks for your help.
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