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On a 460 fitted with cat, the saw is built differently in order to make room around the cat. I've never had anything melt in the two I've owned. That said, you have to be aware that a cat muffler will stay hot WAY longer than an ordinary one. So be careful what you put it next to in the truck.

But then it wouldn't be catalytic no more. Cat mufflers are great when you run alkylate fuel. As soon as the saw is hot, you can't smell it at all. Since I run saws long hours daily, that makes a difference to my lungs. As for shortening the life of the saw, I have never noticed a difference...