There may be other mufflers available from engine mfg. that will just bolt on. Look for the model number and type of the engine itself and check with small engine dealer or engine mfg. web site (not coleman web site). I have seen many home-made modifications to quiet engine resulting in only moderate success. The quietest used scooter muffler but only exaggerated the sound of the intake and mechanical sound of internal parts. Take a look at generators built for camping for ideas. You will notice that not only do they have larger mufflers but also use insulated covers to deaden sound. Good luck with your project
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