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Did not touch anything on the steering rack. Ceramic coating on a header helps a lot, I don't have data, but you can feel a difference in temps under the hood coated vs non-coated after a spirited run. You could most likely run non-coated stainless steel header without problems but for road racing I would always go with coated. I do all the work myself but also have a trusted shop in town that I run to when I am stuck or out of time.
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