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Message: <blockquote data-quote="astroboy" data-source="post: 561557" data-attributes="member: 4527">The only Piper I know is this.. :4:<img src="http://www.martinfrost.ws/htmlfiles/dec2008/pied-piper.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />Be careful when oiling the element, are they using oil like K&N? The oily fume will coat onto the MAF filament and reduce it's sensitivity through time. MAF is not cheap and very sensitive. You shouldn't be washing it too often. If wrong oil were to use on the element or wrong washing technique, MAF rosak very expensive oh!.. :48:Must always understand the trade-of when ever a mod is to be undertaken.  I'm staying away from oiled air filter element for now for my E90.</blockquote>