After much agonizing reading I decided to replace my K&N air filter in my 90 K-5 with the evil low flow paper air filter. I used the Fram CA 326 air filter not my first choice but at $ 4.65 at Wal-Mart I couldn't bitch too much. What sold me in replacing the hi-flow K&N with the standard paper air filter was the fact that paper just filters small dirt particles better than the oil soaked cotton will. I’m not rich so engine longevity is more important than hi air flow and the possibility of engine damage. I really never did see the mileage or horse power gain that K&N hyped on there web site so I guess it really wont matter. But I know that my engine will last longer. Any comments on this switch? Dan..