I've been searching the site for information on the engine cover or as the shop manual calls it, the "spark plug hole plate". The insulation on the bottom side of mine is just flat falling apart. I have white flakes all over the engine bay. I was going to pull off the insulation of an replace it with some radiant barrier insulation but then I got to thinking, with the radiant barrier reflecting heat back onto the engine ( plug wires, injectors, fuel rail etc) I may do more harm than good and maybe the white flakes aren't that big of deal. Anybody have any input on what the insulation on the bottom of the cover is for? I'm starting to think it is more for noise than heat. Any thoughts on what to use for replacement material?