That cardboard tube is a neat idea, never heard of that. I still have to look into sandblasting costs out here. The painted Flowtechs on my truck still aren't rusty, even with around 17,000 miles of almost daily driving... I'm sure the mostly dry climate out here helps. The headers are the only thing detracting from the engine bay in the '78 now, other than the horribly rusted underside of the hood.