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I'm using a K&N high flow filter, and I don't replace it, I clean and reuse it. I'm pretty sure that the cabon build up you see in KBoggs's photos have nothing to do with the airfilter. More likely it's a PVC valve or AOS issue, but that's just a guess.
Tony
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Lapis Blue 03 Boxster S
Seal Grey 04 Boxster S (RIP 9-21-14)
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