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I did a little and each produced a bit of drone protection in different RPM ranges (just a few though from 26.5 to 30"). Since here in Texas the speeds are a bit faster on the highways I pushed it in to 27" length and it seems to cover the 1800-2100 rpm range fairly well. Still have just a hint of resonance occasionally but much better than without and is tolerable (vs without which was intolerable to me and my passengers).