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I'm not sure about this particular situation, but most places will use some combination of silicon-aluminum and ceramic polymer, mixed with polymer dyes.
It withstands very extreme temperatures, and doesn't flake or peel off very easily once properly cured.
Key phrase. If the prep isn't perfect, same as curing, it will flake off in no time between the heat generated by the turbo and the temperatures under the hood, especially in a black car in Cali If all turns out as planned I think it'll be a nice original touch .