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Originally Posted by DarkJak
Isn't there an issue with catalytic converters disintegrating when they get too hot? Would that possibly be increased with wrapping, since it traps more heat inside, or does the lower cel count negate that?
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That's why people say not to do it, but I've personally never heard of a cat failing from it. I'm sure it's happened, but I haven't seen it. I'm sure you're decreasing the lifespan of the cat, but whether it's by a noticable amount I can't say.