By the title I thought I had me a job!! I would say they are all very close in sound. My volant gen 3 was louder than I wanted and it was a complete sealed box. I bought it because I thought it being a sealed box it would be quieter. If the filter is open like they all are they will have more sound to them. Now the Volant 3 also has a snorkle the get air from out front through the hook opening on the bumper and that might make it a little more quiet because it is no longer sucking through the fender.