Tripac APU muffler getting loud?
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Don't go replacing it too quickly.
I learned the baffles inside like to build up with soot/carbon. Tap on the muffler with a hammer and watch the debris come out of the muffler.
And listen to the APU suddenly get quiet again.
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Just went though cleaning out the carbon buildup on my ATV muffler.
They make the muffler with a plug you remove, to make removing the carbon easy, but those plugs usually have to be heated up red hot, before they budge.