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      04-23-2012, 09:50 PM   #17
rondocap
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Drives: 335i Sedan
Join Date: Feb 2012
Location: NY/NJ

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The normal heads are supposed to be mounted horizontally, but the "BMW Edition" heads were engineered to be mounted vertically, and as long as it is installed correctly, I have not read or heard of any performance issues.

The diode is made so that vertical mounting is OK.