I went with the fmf muffler because it was a bolt on and it was fast and easy so we could ride at Gorman. The noise and power loss was a disappointment, but after I made a tail pipe and 3/4 insert it works really good. It did take me some time to make and a 4stroke muffler would have been better now that I can look back. But I will know for sure if the power is better when we go to the desert in October to get a better feel of the power at sea level.
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