I've been wondering how a chambered muffler would sound? I ran some Hooker Aerochambers on my old Plymouth Duster and it was the best sounding muffler I'd ever used. They weren't raspy at all and didn't drone at cruise speeds like Flow's tend to. Just a nice, mellow, deep exhaust note. The largest one I can find has 3 1/2" inlet and outlet with a 14" case. Don't know how well that would keep things quiet. I do know that Hooker claims that they will flow 441 cfm of exhaust.