Thanks for the responses so far. If I can't hammer the socket over the
nut and were to instead cut off the rusted nut and bolt with a dremel
tool, would I be able to replace the bolt coming from the cat or is it
spot-welded to the cat? The service manual isn't clear, and I haven't
yet taken the heat shield off the cat to inspect the cat-side of this
joint. Because maybe the bolt should be replaced anyway, since it also
apears a bit rusty?