A word of caution is needed here. Do not install any materiel which when heated could give off toxic fumes. Ordinary styrofoam can kill you if you breath in the gases given off when it is only heated. Bad enough you could have a fire you don't want to be knocked out from the fumes before you can get out of the car. On all modern cars the materiels used in the interiors must pass certain combustion, ignition, flame spread, and toxic gas tests. The best source for noise deadening materiel is Eastwood.com. They have all sorts of neat stuff if you are into cars.The best place to start is on any large flat surface to eliminate "booming" or the sounds of being in a drum. The other best thing to do is to make sure all of the door seals are in good shape to reduce wind noise. Make sure any openings in the firewall are sealed too. David Teitelbaum vin 10757 --- In dmcnews@xxxxxxxxxxx, qrorell@xxxx wrote: > If you look inside of the front door posts of most new cars you will see styrafoam is used for insulation. > It is the best and cheepest way to cut down noise. You can shape it any way you want to by using an electric knife. then fitting it into the space. It can be purchased in blocks or flat sheets in any thickness.