in some cases k & n is good for some but not for all, i wanted a k & n filter but after reading many goods and bads on this site i decided not to. it turns out their seal isnt so good. usually the filter gives a high silicone content in the oil. i dont want to deal with it now. id rather have a good paper filter with no restriction by having no air box. on this one page i was reading they tested an stock air filter in a modified box wiht added air intake and then a k & n in a normal stock box. the regular air filter in the modified air box performed jsut as well and a little better than the k & n in an air box. ill find it and post it later