Video of the GFB Hybrid BOV on my car:
I took it easy on the shifting, so you could hopefully hear the valve better. I also did plenty of partial boost shifts so you could hear that it doesn't flutter (like I've had problems with). Unfortunately I had the driver's window up (and the other 3 cracked), so you can't really hear it as well as you could if they all were open. We'll see if I get tired of it or not. Right now I really like it. It seems very responsive, and really isn't all that loud.