I removed mine when I first bought the engine and stripped it for a rebuild/paint so I've never had them in during my Monster ownership.
Can't comment on before/after noise as I never heard it before and it's pretty loud anyway but I don't think the rubber things make any difference?
IMO they must impede (albeit probably only very slightly) airflow and so can't help with cooling?
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M900, 916, LeMans II.
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