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Message: [QUOTE="uw mitch, post: 1030013, member: 13665"] So in highschool since I worked at a stereo shop, for one of my science classes I did a before/after experiment of dynamatting and foaming the head liner on my 4Runner. Made a huge difference on road noise and my max SPL went up 3dB. So I did a little research on the latest and greatest since it'd be 15 years since I did it. Basically the difference now seemed to be slightly less use of matting, matting is now less expensive (Dynamat brand isn't the only game in town) and use of sticky backed acoustic foam is more prevalent. With the doors I sheet metaled the access hole, applied the matting, then acoustic foam sheet over. On the back wall, it's was pretty straightforward. Matting + foam sheeting. For the floors, I basically did what I could get by peeling back the carpet liner without actually pulling the whole carpet out. Since I'm not building this as a competition stereo vehicle, just wanting to reduce some road noise, I figured that'd be good enough. Between the matting and inserting silicone tubing in the door seals, I was pretty happy with the noise reduction. Riding in a Lexus this is not, but now I can mostly hear my wife when we're on the freeway at 70mph. [/QUOTE]

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