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I've had a couple of 260s and 2 or 3 460s with CAT. I used to be really bothered by exhaust, to the point of getting bronchial problems, when cutting dense stands in the summer. That was why I switched to alkylate and CAT saws. Then I found out that the problem was my body not being good at...

We still have one 260 with a CAT on it. Runs better than stock, actually, but is also a bit louder. When you run a Cat saw on alkylate fuel, it has no smell at all.

Back when I ran CAT saws, I had to watch out. Those mufflers got red hot and stayed hot long after the saw was shut off.