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      07-24-2010, 11:42 PM   #11
Diokaef
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Drives: M235I 2015, 335i 2011
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2008 Z4M Coupe  [4.50]
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Just came across some reading material http://www.carcraft.com/techarticles...ngs/index.html

and it reenforce my observation that for the headers alone the hp gain is not noticeable but still offer advantage over not coated ones.
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