What's this sound?! (video link)

pieces of catalytic converter in the mufflers ??

mine sounds like that and i know its pieces of cat in the mufflers, both of them.

im guessing u still have all the stock exhaust components ?

give your mufflers a shake and see.
 
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The sound is def coming from the bottom of the car and to the front. Me thinks cats as well. How did this happen though? Do cats just go bad or is the bad cat a symptom of something worse.

I was having cooling issues due to the fan not working. The temps got up there on more than a few occasions. Maybe I burnt out one or both cats...is that possible?
 
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Most times, the cats I have seen do that just did it on their own. I have seen some so bad that they had come apart and ended up in the rest of the exhaust system. Best way to check is with a rubber mallet.
 
I hear that a rich condition will cause the cats to over heat and break up. Its your cats all broke up and rattleing in the pipes or mufflers.
 
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