[eckoman_pdx]

Dynamat is what you want, as was said by honda_racing101. I prefer dynamat extreme, lighter than orignal, dampens better and the reflective aluminum paret acts as a heat barrier also. It also installs easier, it's just peel and stick (after cleaning the surface), no heat gun needed. It also holds well to upside down surfaces (roof, trunk lid, etc).

It will really make a difference. I have 6 bulk packs of extreme (216 sq. ft) in my car...okay, I went nuts and covered every sqaure inch, but with dynamat, a little will go a long way. You don't need that much.