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      12-05-2012, 01:04 AM   #14
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Drives: E92 335i, F30 328i, F82 M4, i8
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I'd be weary of unreputable branded filters. I'm a big fan of the DIY mentality but not all filters are created equal in terms of the amount that actually gets filtered as well as the flow.

Then you have to worry about durability. I've personally seen cars come in where the metal filter end had separated from the paper element which allowed dust/sand/dirt to enter the intake tract unfiltered. You could drive thousands of miles without realizing the filter had separated/failed.