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Do you have a link to the one on amazon? I can't find one on there for the E9X. If the aftermarket is a carbon filter (not just paper) then I MIGHT consider trying it. That is only if there have been positive reviews on the product already. In the end, a filter isn't really that hard to make, so an aftermarket one could very easily be just as good as OEM.
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2007 335i SG Coupe
2009 128i AW
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