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Unfortunately, the wrap tends to hold moisture against the headers, and causes them to rust out a lot faster than they would if left bare. While the coatings are expensive..... they actually help the headers retain heat, AND help them last longer. (if done properly.)
Wrapping is really for tight engine bays where there is little air circulation.
We have plenty of room for air to move around the headers, and if you're really concerned about engine bay heat, vent the hood.
I wish I could cowl it but $$$ is king. I may leave it unwrapped as the factory is that way anyways. And heyyou is right because if it's moist out I don't need to be rusting my headers off
Do you want to pay the $150 now, or another $375 (plus gaskets and your time) to replace it all over in a couple of years.
I can understand scrimping on an easy change item, but something that takes more time and effort to change, it usually makes sense to do it right the first time.