Dinqua
I remember reading that same article a few years back, picked it up off another bike site during one of those drawn out "my oil filter, air filter, tires are better than yours" threads.
There has been alot of independent testing of various filters out there (don't just rely on the manufacturer!!!).
Do a net search for 'air filter tests'. Most of the testing has been done by car guys with too much time on their hands, but from my reading the K&Ns were not all that impressive.
But I sent an email anyway - variety and choice is good for all of us.
