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Nothing to carving a muffler .Remove all the baffles and screen ,cut out all the diverters and make the outlet or outlets about 80 percent the area of the exhaust port .Retune the saw so it is slightly 4 cycling at wide open throttle and go cut wood . If it runs lousey already you don't have...

They probabley have the mufflers choked down and are set lean .Not lean enough to cook them but enough they don't have any power. Do a little muffler carving and retune them ,probabley wake right up .