Wilkinson's are the best alternative IF you need something resembling the originals.
You are being limited by that criteria.
My discussion with Wilkinson was that "he" had the system dynoed and there was a 75hp gain over the GPS system.
His headers are stainless also and I think originally he had them available as mill finish and polished. I don't recall him saying anything about ceramic coatings?
Check with him because he makes these things in batches and I've heard he sold out on them?
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