I've been in a 25, 23, and 21 now with the sound dampening. The 25 with a 575 and sound dampening is extremely quiet over the 440 and without it. It's a night and day difference. The 23 and 21 are both much quieter. We were in a 23 with sound dampening with a group of 6 people all in the cockpit area and running back to the dock doing 28mph and were having a regular conversation, no yelling or trying to talk over the motor. I'll see if I have some videos but having been in plenty of MBs without the sound dampening it really helps.