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they are not coated. most people are just running them as you see them. before the turbo piping is more critical than after the turbo in terms of wrapping and coatings (keeping the heat in)
that won't matter much with turbos on the manifolds.
and post turbo piping it is very critical to heat wrap them on a manifold or front mount turbo system due to engine bay temps. It will make drastic improvements in cooling the engine bay which leads to less heat soak into the charge pipes therefore lower intake temps.
