This year I added a subwoofer to my car and used a Noico muffler in all corners of the trunk. I thought about buying this foam for the doors of my car. Apparently that's what I chose to do. I was hoping to further reduce road noise and get a little more sound quality from the Infinity speakers in the doors. I'm apparently very lazy, so far I've only done the driver's door. I first applied as much Noico muffler as I could fit and then applied cut squares of this foam. The application process is about the same for both - be sure to use a roller. My Honda Accord now sounds like a Mercedes when I close the driver's door - with a solid and confident BLOW! Road noise is reduced and I get better/stronger sound from my speakers. The foam seems to be holding up well, although I haven't taken the door apart to double check. I think one box is enough to get a reasonable cover for 4 doors depending on your needs. Don't expect it to drown everything out, you should have reasonable expectations. I have to hurry up and do the rest of the doors to get the best score. I'd recommend spending the extra money to add this if you're doing soundproofing anyway. I read a lot about Noico before I closed my trunk. I was on the fence of their silencer or dynamat brand. Some of the reviews are good and some are not so good for Noico. My experience was very good and I'm glad I rolled on it. You haven't let me down yet!
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