the b-quiet? Ive used it in many many cars, customers who say their car rattles alot say they want their car "dynamatted" and half the time I Dont think they understand what that actually means. I show them my rolls of this stuff (I buy lots at a time) and tell them how much it is and they are usually surprised, so what was a trunk job is now also a front door and wheel well job aswell, more money for me, and better sounding for them