METAL COMPONENTS WITH A HEAT RESISTANT COATING FOR USE IN ENGINES, NAMELY, PISTON CROWNS, VALVE STEMS, ENGINE BLOCK ENTRY PORTS AND ENGINE BLOCK EXIT PORTS; METAL COMPONENTS WITH A CERAMIC COATING FOR USE IN ENGINES, NAMELY, PISTON CROWNS, VALVE STEMS, ENGINE BLOCK ENTRY PORTS AND ENGINE BLOCK EXIT PORTS; METAL EXHAUST COMPONENTS FOR ENGINES, NAMELY, PIPES, HEAT SHIELDS, TURBOCASINGS, SILENCERS AND CATALYST BOXES EACH HAVING A CERAMIC COATING