The dampers reduce vibrations and noise. That’s what I read in a few research papers on this subject. I have no idea how much effect the dampers have, but that seems to be the goal.Hmm, so someday when my driveshafts snap from living in the Rustbelt of the USA and I need to use the spare ones I already have, I should remove the dampeners? Good to know! If the shaft is solid why did Honda even put those there, sheesh.