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catalytic converters coming apart? The exhaust sytem is unboltable and in your garage you can unbolt it and inspect them yourself at no charge. Just don't forget to get the PB Blaster to spray those exhaust bolts to make it a smooth afternoon for ya.
Possible right side cat breaking up inside and causing exhaust restriction? Just a few simple/easy things to check. Good luck with it.
PS--I was thinking you had a 95 with true dual exhaust. If the 94 has the precats, y pipe and then main cat I would bet $$$ to donuts the precat has come apart inside and pieces are getting pushed back into the main cat, causing the exhaust note change. Not so sure about if that would cause a vibration though, but possilbe I suppose.
The passanger side cat in my 95 with the same mileage just went bad. The symptoms are very similar to what you are describing. I'm getting rid of the cats when my headders come in next week.