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E-man930 E-man930 is offline
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Join Date: May 2005
Location: Atlanta GA
Posts: 624
Depends on the coating.
If you have them cad plated you are fine - you are protecting the outside from corrosion while allowing the heat to "escape." If you ceramic coat the outside you are insulating the pipes from the wrong side trapping a good portion of the heat in the metal. So you end up with the metal taking more of the abuse then non-coated. Regarless if the headers are made of 302, 321, or Inconel 625, there is a fatigue life associated with heat cycles, metal deteriation from the caustic gases flowing through the tubes, etc... I plan on ceramic coating the inside of mine (mine are three peice design like Don E with V-band joints so they are much easier to clean and setup to properly apply the ceramic coating) and plating the outside to let the metal radiate whatever heat it can out of the metal portion of the pipes...
Old 06-02-2008, 09:09 AM
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