I am not advocating one type of air filter over another, I just thought I would share one Boxster owners experience with a cone-type filter element, mine is part of a TTP intake. I had it installed a couple of years ago, before I knew much about the discussion about possible clogging of MAF sensors and oiled, paper filters possibily doing a poor job of filtering. I just knew it sounded great, as most of the aftermarket intakes do.
I have used my oiled TTP filter element for about 35k with no problems with the MAF what so ever. I clean and oil the filter element pretty often, because it gets dirty so quickly. I probably clean and oil it every 5-7K on average. Over the period of use the cone-air-filter, I have sent my regular 5 to 7K engine oil change samples in for analysis. They have come back saying the oil was very clean, and on one of the analysis sheets, they said whatever kind of air filter I was using, it was doing a very good job.
I am pretty careful when I oil the filter element. I usually blow some air through it after I have oiled it and lightly rub a rag over the surface. I dont know how different the cone-filter I use is, but it is sourced from BMC I believe. These filters are are not cheap, I think I paid 160.00 for an extra filter element. One more data point.....
Ed
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