Jet Hot

I had a set of used exhaust manifolds done,If they are not really smooth from any pitting they have a tendancy to rust where moisture forms in the pitted areas If you live where there is HIGH HUMIDITY! Other than that they are great.I did send them back under warranty and they redone them free of charge.But they still have some small rust spots after 3 years.If you are having new products done such as headers or new exhaust manifolds I think it will be better. The product holds up under the heat very well.