Thermal Barrier - Sound Deadener - Lizard Skin

If you go with one of the 'mat' products (ie: not spray-on), I'd recommend going with one of the butyl-based products rather than asphaltic-based. The asphaltic-based stuff is more prone to melting/detachment due to high temps, not to mention the increased 'stank' factor.

You'll find that the butyl-based products cost a little more, however.