Either of the copper permatex products is fine for exhaust usage...
But I would never personally put that stuff on my cat-back gaskets. You'd have to clean and re-apply every time you drop the exhaust for any reason... I guess if you knew you wouldn't be removing the exhaust for years, it'd be a good touch though.
I have it on my header gaskets, works great. The stuff is able to survive much higher temps than they give themselves credit for.
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