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Do not use K&N filters on cars with maf sensors. The oil used on the filter element will foul the sensor. Use only Mahle,hengst or factory filters. Its okay to use K&N on the older cars with the barn door sensor&I haven't had problems with the hot wire type either. The Maf sensors are pretty much junk when new.Had many failures on Porsche,M.B.&VW products. Not as big a problems on BMW though. Go figure that one.
Howard
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