Who makes the best air filter for ATVs. The one that keeps the most dirt out of the engine.

 

Maybe K&N air filters. I dont have one but im thinking about it.

 

For the greatest guarantee against any dirt betting in, that would be stock filters which are thick and very dense foam. This is the way to to if you are one who tends to neglect air filter maintenance!

For a better airflow but great protection, UNI which has a less dense outer fitler and a more dense inner filter. Service it properly and often!

K&N..........never off-road.