[AzGrower]

Well there are several different materials that will work. Like already mentioned, the egg carton type foam works well. But its bulky as all hell. I like my closed cell foam, or Ensolite, as its known. YOu can get it from Raam Audio (Rick the owner) sells it for great prices. I have Ensolite over my deadening matting (Raam BXT60). That combination works the best. Here are a few pics of my stuff:

Raam BXT60 (2 layers) on doors panels:
http://memimage.cardomain.net/member_images/2/web/518000-518999/518721_69_full.jpg

Floor of extra cab (again 2 layers):
http://memimage.cardomain.net/member_images/2/web/518000-518999/518721_158_full.jpg

Ensolite on rear cab wall (sorry for the hard to see pic of it...its the black foam stuff on the back):
http://memimage.cardomain.net/member_images/2/web/518000-518999/518721_165_full.jpg

 

[AzGrower]

Ensolite Foam = [email protected] Rick McCallum is the owner, he will give you a great price on it.