4WStuning:::Evo 8/9 Stock Replacment Tubular Manifold!
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It's not powder coating, it's a ceramic coating. In a car that is being raced, it can help keep engine bays a little cooler. In a street driven application there isn't a ton of benefit, other than it does keep the part looking a lot nicer. I'll probably have mine done, mainly for looks. I'd like to see a couple of these coated first though.