My problem seems to be the helmet itself seems to resonate with the exhaust sound. Even earplugs don't do much for it. I suspect since modern helmets fit tighter and contact as much of the head as possible to spread the impact load, they also transfer the exhaust sound to your skull where it's picked up by your ears. That would explain why earplugs don't help much. Wore my piss bucket the other night and what a pleasant ride that was. Tempted to go back even though I know better.