What is it? what does it do?

The only times I ever really hear about it is on high power builds, like 1,000 whp type of builds.
Sometimes the coating is red, sometimes it is black.

I mostly see it in the exhaust ports, but every so often, I'll see the combustion chamber coated too. On rare occations, I

'll see the inside of the exhaust manifold coated in something similar, then the exterior cermanic coated.

Pictures from a 1,000+ whp 300zx build.
someone then asks -
and the only response given is
Here's the thread they are from - 300zxClub.com (Nissan 300ZX Forums)
those pictures are on page 6.


I would have to assume it is a sort of heat block.