I put a lot of b-quiet in my car. i think around 150sq feet. I had an extremely loud exhaust and it quieted it a lot. I also got a cleaner sound out of my mids and lows. I did a lot of research and this is the cheapest price you can get a decent sound dampener for. Goodluck installing it. I spent a full day putting that stuff in.

HRC Stage II w/ FMIC | AFX UDP | Magnecore Wires | Tanade GPower Medallion | Tokico Stuts and Springs | 18x8 Konig Villains | Yokohoma Paradas | Damn Good Stereo | A bunch of other common shit | Completely Rebuilt