I have 1 chamber Flows. They're an aquired taste. Basically, it'll sound like a ProChamber w/ 2 chamber flows, but significantly louder, and with a bit of a pop, sort of like SLP, Magnapack, Race Bullits, etc. They tend to piss people off but, on a side note, it's possible to keep the racket down if there is a cop around, I can't say the same for my cousin who has an O/R ProChamber w/ SLP Loudmouth.