i met up with the amsoil dealer today to pik up my oil, and i specificly asked him if the k&nand the amsoil wer the same and he said thy werent, he said the things that are different is that the k&n holds the dirt deep within the filter material and thats what leads to the filter clogging and bad performance of the filter, the amsoil actally doesnt allow the dirt to penitrate the filter material and t basicly just sits ontop of the material and not inside the material, he showed me how the filter can actually just be vacuum off and the dirt just comes right off, or you can use a air compressor and literally blow the dirt right off the filter, really interesting.