K & N or equiv Filter for A4
If you are expecting hp gains, forget about it. Audi designs a very high flowing air box to begin with. Be carefull with oiled filter medias. Over-oiled they can kill your MAF element.
still with the open element air filters tend to cause misfires in some situations stay stock you do not get ant gains and for the money you spend for a little extra sound definetly not worth it and yes the K & N filters the oil on them will clog your MAF then you will have more issues
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