Maudib should chime in here. I know he tested the Quiet Pipe against stock DA, and both Bisson and another brand Pitts wraparound. Interesting results (which I can't remember now), but I do know that Chip's pipe had substantially higher RPMs than ALL other mufflers. It was much quieter too, he tested them with a DB noise meter.

However, he installed and tested these on an EF Yak, not the Vision. Performance will be the same but installation would obviously be different.

Tom