Best Engine Air filter and Microfilter?
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Join Date: Apr 2008
Location: SoCal
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My Ride: 14 550i
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Engine Air filter you have BMC or K&N. Microfilter doesn't really matter. I'd just buy the cheapest one. ![Smile](https://5series.net/forums/images/smilies/imported/smile.gif)
http://acuteperformance.com/air-filt...-m5-c-75_80_81
Michael
Acute Performance
![Smile](https://5series.net/forums/images/smilies/imported/smile.gif)
http://acuteperformance.com/air-filt...-m5-c-75_80_81
Michael
Acute Performance
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