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There has been quite a bit written in the forums about this subject. I have had K&N filters in about 15 vehicles in the last 20 yrs and have had no problems related to these filters, but after reading how poorly they filter out the smaller particulate matter I will use them no more. I put a K&N in my 2010 Z4 35i for a few thousand miles but replaced it with the OEM after reading the specs. on the K&N. My X3 will use one OEM air filters.
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