Here are a few vids of mine. One of the vids, I was picking up pulley squeal. That has since gone away. Make sure you wear some good headphones and turn it up. Most of the sounds from the supercharger(s) aren't too loud. Mine don't whine like a Vortech, but it does make a high pitch sound close to a turbo, but not quite, idk how to explain it. The BPV's are clearly audible. Especially when hammering it.