you keep the heat in the pipes to keep the exhaust velocity up. So i'd imagine that swain coating the exhaust housings would help to keep exhaust velosity up. ANd imagine that this would also keep the intake charge up. And correct me if im wrong, but by wraping test pipes, you just keep heat away from the turbos to keep the intake charge down? I wonder if swain coating valve covers would also help, seeing as they sit next to the intake manifold this should help to keep the intake charge cold?