I've never done what you suggest, but at this point you don't have much to lose. If it doesn't work you can buy a new muffler. Last time I checked they were still available.
I would check that the cooling fins are clean and that it's not running lean. That could also make it run hot.
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2264 with 54 GT deck
1641 AKA Black Jack with a 402-E Haban Sickle bar mower
JD317 dump truck
BX2670 with FEL
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