So.... I have been having problems with the local law about noise from my sbc jet. I have tried a couple of different styles of baffles and most of them had major power loss, and still were not all that quiet at idle. I ordered a set of shotgun's from drew marine, and let me tell you these things work very well.
We have not tested it yet with the db meter, but should have some numbers later today. Sure is quiet though, and no noticeable power loss.