I noticed a significant drop in noise from my clutch going from the stock steel setup to an aluminum/carbon deal. Plus you drop a lot of rotating mass enabling the engine to rev a bit quicker. Part of the loss of noise could be the tighter tolerances of the new clutch. What I mean is the old clutch had worn out and banged up tangs on the plates, and dents in the basket, so the smacking of the two together probably had more force, and thus more noise. If you really want to quiet it down as much as possible go to a closed clutch cover. But if you just want a modest reduction in sound, go for the plates and basket.
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