You have a plugged exhaust, replace the catylictic converter and find out what make it fail and plug, rich fuel mixture is most common cause of overheated burnt cat. The EGR is just a symtom of the plugged exhaust.
No, that is not the way to check, to be sure you need to run an exhaust back pressure test, (a muffler shop can help you as well), a shop has to do this, it requires a few special tools, but I am sure that is the problem by what you said about the EGR being burnt, the pressure in the exhaust causes that. Do you understand? If not call 925-459-0571
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I was told to tap on the converter and if it sounded hollow it should be ok. I don't know if this is a correct way to check it or not.
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