I installed my Delkevic with the baffle removed, so I didn't appreciate the difference until I popped it back in. Without it, It sounded great at first, but on a long ride the drone would start to get annoying. I was surprised at how much difference the 'spud' made when on the bike. I still sounds good off the bike, but appears much less fatiguing on the bike with the helmet on at speed. Need to go on a longer ride to really get a good sense of it.