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On my E55, ive used Green, and I currently have BMC...The bmc feels a likes its got a little bit better airflow...but Im going to change out soon, I think im going to try out some K&Ns, sh*t it Jangy is saying theyr good, IVE GOT TO TRY THEM.
HAHA!! You do for sure, since I DON'T recommend the green ones. A little help here and ther is cool, but failed filter housings is NO good.