I have the fmf universal muffler on both of our dunes and it was stupid loud with the 1 1/4 open tail pipe. So I used the tubing it came with to make a turn down tail pipe with a smaller 7/8 pipe inside the tail pipe to make some back pressure. Without back pressure the motor runs sloppy and power is down. The noise is livable with a helmet on but still loud for me. I also was thinking the same thing with the 4 stroke packing to reduce the nasty bark from the muffler. I will try to repack the muffler this weekend and get back with you on the results.
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