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Originally Posted by carteach0
First, IF you choose to 'punch out' a catalytic converter, DON'T BREATH THE DUST. That flimsy section is a ceramic honeycomb and is quite strong unless abused. Most last the life of the vehicle without a problem.
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I "punched out" out one of these honeycomb catalyst late today. I secured it on a table vise and using the straight end of a crow bar, punched a hole thru. That sucker crumbled like a dry cookie!!! Total time of removal of catalyst:
5 seconds. It took longer for the dust to settle
I've read a few threads regarding noises coming from these downstream catalytic converters and upon examination by the dealership, the honeycomb catalyst have fractured and broken apart and had to wait weeks for a replacement. My personal opinion and suggestion? Knowing what I know now, and having spent hundred of dollars for this mod, I would punch out the catalyst (for a straight pipe benefit) but remove them from the vehicle first as they crumble like dried up cookie! It would be easier to clean up.
I may do a little experiment when I have some free time. Reinstall these punched out cats and see if there is any difference in performance between these and the straight flow resonators I just had installed.
Enclosed are before and after "punch out" photos of the cats