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Just got my downpipes from Evolve Automotive today - I'm taking them over to the coating company who powder-coats all of our BMW charge coolers. He's the best one in town, and does a lot of work on all types of coatings for many of the high performance companies in So-California (rods, pistons, cylinder heads, poweder-coatings, etc).. he recommended that I get the inside sprayed with a copper lining, and the outside with a titanium ceramic coating. I get a good guy deal, it's $40 p/ sq. foot of coating for the process. I'll post photos of the pipes once I get them back..
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