Post by
EdBwoy »
https://forums.nicoclub.com/edbwoy-u213758.html
Mon Feb 05, 2018 2:47 pm
Thank you.
While it's true that some catalyst elements could break off in some cars, there is nothing about these manifolds that makes me think they'll self destruct.
In fact, I have disassembled an engine whose left manifold had been gutted (by knocking it out) and that engine showed no signs of damage by ceramic reverse flow. I mention this because I cannot think of a better way to convert a catalyst element to powder than to chip away at it.
With the limited experience I have, this is not something I would advice you to be worried about.