ZDZ 80, what muffler?
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I use the Bisson, but like many, have learned that a significant restriction is the last 1/4" of the tubes, where they are "rolled" to a smaller diameter. Cutting those off brought some increase in both rpm and noise on my 80, but it has been a very good "muffler"....6200, Menz 26 x 10 Std, 40:1 petroleum mix.