Air Filter Study

Someone posted a link to this report on the BMWMOA forum. Check out the data on K&N filters.
http://home.usadatanet.net/~jbplock/ISO5011/SPICER.htm

Great link, my wallet thanks you. No wait, no it doesn't, I already paid for a K&N and cleanings cost almost nothing. Awwww now what am I supposed to do ... so confused ...