Originally Posted by hemi_fan
That was really dumb of him to continue destroying his cats... they probably cost a fair amount to replace. As someone else said tho, probably a case of it running way rich and raw fuel backfiring thru the cats.
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once a single chunk is blown out they will continue to fall apart no matter what you do. With all the work he is going to do to the car I doubt he was going to keep any cats on the car and if he was they would have probably been aftermarket high flow ones.