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Old 06-05-2021, 12:17 AM
PontiacJim1959 PontiacJim1959 is offline
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Join Date: Dec 2019
Location: Gastonia, NC
Posts: 492
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Muffler type? I used DynoMax years ago and they had a very noticeable/audible drone right at the RPM range you are getting. Below 2,000 and above about 2,300 the drone was gone. I believe that has been cured with later designs, but that was a common complaint with them years ago.