Sorry Don, guess I should have stated a bit more clearly that I was referring to tube headers, about the only thing I do with the cast iron exhaust manifolds I run across is put them in the "clean cast" pile that goes to the recycler!! Sorry Don, I should have been more clear. Let me correct myself to say I don't run a cast iron manifold on anything, and I would recomend the tube headers with the HPC coating. I had a set on my old roadster for about 5 years, they were on the car when I sold it last spring, and they still look great. They were Sanderson's. Sorry for the confusion, Don.