I work in the automotive repair field and see many cars with failed mass air flow sensors from Audi,VW and Porsche. Not all of these used K&N filters and have seen the sensor failed on cars(both using OEM paper filters) with as little as 2000km with one customers 2000 model VW Golf that has well over 400,000 km on the original mass air flow sensor. The first generation of the sensor are rubbish and have a very high failure rate but K&N filters are rubbish for a street car but if you feel the need to use them after all it's your money. I have one customer who thinks they are the best thing since bottled beer and have solved every driveability problem in every car he's owned with the added benefit of increased gas mileage and HP. No matter what test I bring to his attention proving how crap K&N filters are he knows what he knows from using them over the years and that's the end of it.
MNBoxster..... well said, I agree 100% and am glad you are this forum.
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