If you want to go very inexpensive, go for Reflectix. Available at most hardware stores and has made a huge difference in our diesel 60. Before it and the carpet insulation it was very hot and loud. It used to put out a tremendous amount of heat over the transmission hump, but now is cool as a cucumber. Also, it is easily removable, but stays put under the carpet.
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Very good idea. So is that reflectix the "foil/bubble/foil" stuff? I hope so, because I have a ton of it left over from radiant heat projects on my house.
Also, what is the blue material? Thanks!