Insulating the engine bay

[Arcticdude]

The ceramic coatings will drop the temps maybe 300-400 degrees, but when running a little, the turbo and close parts will still be pushing 700 or so. The polydamp hydrophobic melamine foam that I've got coming handles 375 sporadically. But the same company has a true thermal barrier that handles 800. I'm wondering if I shouldn't be using something like this near the turbo and exhaust.

See here: http://www.polytechinc.com/products/thermal.php and scroll down to the Polytech Heat Shield.