dave pauls was done by ian and that cracked ive seen it, tony turbo had a coating aplied that i believe cracked off aswell what kind of coatings yours? doesnt metal expand and retract on heating up and cooling? so surely common sense tells you unless its a heatproof rubber coating its eventually gonna crack? not a dis young man just passing on what i know personally id have the manifold less the coating like i will be haveing soon for my 16v and i,ll heat wrap it myself