NASCAR spends thousands to find half a horsepower. Also, and much more importantly they demand durability at almost any cost.
As such, I 100% agree that coatings can protect parts and promote durability. Do they help with hp, probably but to a degree that most of us wouldn't find the cost to benefit ratio appealing. The thermal barriers would probably help in a drag racing program, but a street car or road racing car would have heat soak issues after a while. The coatings only slow down the thermal transfer, they don't stop it.
My take, do it help the part last longer, if there is a power increase that's icing on the cake.
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