the header wrap works good heat wise, I can hold my hand within an inch when the sled is running after long pulls, BUT< the problem is the stuff just seems to fall apart if it gets wet.. which sorta happens a LOT on sleds.
Might try some ceramic coating, might not hold heat in the same, but it wont fall off and make a huge mess everywhere. the stuff is nasty, I am still pulling bits out that are under my motor.