On many cars and trucks, the insert is used for noise dampening yes, but I think more so for blocking heat that actually causes paint discoloration on the top of the hood. You could easily use some lizardskin to block heat the same way and block noise as well. Obviously it won't fall off either. I have also seen sheets of aluminized insulation similar to what we have available from most auto parts stores. It would be attached in the same manner as our stock insulation.