Turbo heat is a whole 'nother animal. 321 stainless, and double top-secret coating for sure!
For N/A cars, the bronze natural look of 304 stainless is pleasing to my eye. What's cool is that the color slowly changes from the the exhaust port all the way to the tail pipe. The other thing about coated headers is that one little scratch ruins the whole look. They have to be sent out for re-coating. Natural stainless scratches can be rubbed out with some 3M red scotch-brite.
My Z06 headers are coated, and look good too, but are slowly losing luster. Of course, that motor stays near redline for 20 minutes at a time, so they see all the exhaust heat a normally aspirated motor can throw at it.
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