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Originally Posted by tiga901
Anyone know the K&N Air Filter part number replacement for the e90
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Why? Why do you want mess up an ultimate driving machine with a piece of junk. If you want to increase the air flow, you can achieve the same thing by using your significant other's used panty hose wrap around the air intake. Don't fall for the KN Advertisement hype. If the auto manufactures think this will work, they already jump in there with two feet.
