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Yes, K&N's work: more so on some applications than on others.
However, I'd rather spend $ on replacing (vacuuming out my stock filters works for a few times) my factory filters than see black oil every 3-4k miles because my K&N's letting in too much dirt.
I see a noticable difference in oil color on my 911 turbo between the k&N & the OEM Mahle paper filter. Noticeable. That might be somewhat irrelevant, but still, peace of mind to know the factory pulls more dirt/dust.
Mark
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Porsche Club Racing National Scrutineer
'89 Andial 951
'82 928R
'74 911 RSR 3.6
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