I have a set of thorley mid lengths on my ram and after 3 years or so the ceramic coating was gone. The engine compartment in my truck is a lot more open than in a car, that may have extended the life of the coating by having more open air surrounding them. I would go with SS, or if you don't mind pulling your headers off and on every few years just get a can of ceramic paint and recoat the headers.
I would like to see a dyno sheet on the performance gains of these shorties. Over the stock manifold.
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SSinister
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