I love my Pro chamber, its nice and quiet while idling but not too quiet. It sounds the best when Im accelerating a bit spritedly or going at WOT. Thats why I bought it, I had an X pipe and hated that 2,000k rasp that Mustangs get, dont get me wrong it sounded awesome but I didnt want it that loud for a DD..
Heres a video of my prochamber and the old x pipe but its on my buddies Mustang lol.