We've been through this topic before. I use a K&N on my Nemesis, and have for a long time. I like it. There is no science indicating that it doesn't filter small particles as well as a foam filter. Small particles are just as harmful to a large engine as a small engine, and K&N has PROVEN itself for years in desert, mx, flat-tack, roadrace, etc., for years. Can't get much smaller particles than desert silt, and the desert racers run these for 100's of miles without servicing. I haven't had ANY trouble. I'm sure you will be well satisfied if you decide to use one. Don't forget to use K&N oil. [8D]