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I have 2 Rippers installed with the stock ****. NO Noise at all.. make sure the shift **** is screwed all the way down, good and tight. It gets better with age... took mine about 5000 miles before it did not feel nochie...
One trick is to cut a tennis ball in half open a small hole in the top center and slip it over the shifter lever and seat it firmly at the base of the OEM rubber insulator. It fits snuggly inside too. That should eliminate and drive-train noise if that's your issue.
The silencer ring that is made by Kirban may work on the Ripper. I got my Kirban over 2 years ago (before the "ring" was standard) and noticed some noise. I bought the upgrade at Xtreme in Tempe, AZ. I cured the prob.
YMMV -HarleyB