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My T160 has the same muffler , it is really harsh "apparently " when I got it it had nothing inside , so I found some perforated tube about 1 ¾ or 1 ⅞ about 8" long  and welded it on behind the multi tube exit , then wrapped it with some industrial fiberglass tape its white about 50mm x 3mm and held it on with stainless .032" mig wire , it sounds a bit better , helmet and ear plugs to remove wind noise   , but it's still pretty loud , I didn't close the end of the perforated,  I thought that might kill it .