[fragdude]

K&N does have a very firm stance about their filters not causing MAF problems due to the oil. Someone, however, did run a test on the filtration performance of aftermarket and stock filters here:

http://www.bobistheoilguy.com/airfilter/airtest1.htm

I haven't read it again, but I believe the conclusion was that the stock filter was more restrictive but cleaned the air better. Maybe this is the cause of the MAF problem? maybe the Outerwear pre-filter helps the filtration enough that it doesn't matter? All I can say is yes, it would be really nice if you could just open up the side vent and change the filter