The mantra I've always heard about K&Ns (and other cotton gauze filters?) is that they dirtier they are, the better they filter. At least until the amount of dirt starts restricting the flow. I think that the 2.8 years of dirt on my Sport's filter may be starting to affect its performance

Beer is my Gatorade. Hooray Beer. '98 "Sport" Pacific Green '98 E0 SVT Silver Frost Pictures