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I have 2 cats... I didnt put the exaust the previous owner did. I have, im assuming almost true duels. Each header has a pipe that goes into one muffler with 2 cats before the muffler.
there should be a 100k mile warranty on catalytic converters. call the dodge dealer and ask, if they're bad, you should get them replaced for free.
This goes along with the engine thread I have, where it overheated pretty bad, and its likely the cat(s) or O2 sensors will need to be replaced because of it.