If you *really* have to use it, I would suggest to avoid reoiling the filter and just buy a new one (pre-oiled) for replacement when it gets dirty. I would go with the stock filter if I were you as MAF on boxster is extremely sensitive.
If I'm not mistaken, MNBoxster also said some time ago, that the K&N allows more dusts particles into the engine, possibly damaging the MAF in the long run.
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2004 Porsche Boxster S
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