I am running a BRP/SOT supercharger with the Invidia 70mm single, Invidia test pipe and silencer in. Cruising at light throttle highway speed it is reasonably quiet. At partial throttle it gets a good bit louder, with a low rumbling tone. At WOT it is screaming and very loud even with the silencer. My neighbor says he can hear me coming down the highway from a half mile away. Too loud for me without the silencer, but it might be fine in a turbo application.

Here's a pic of mine.