injen intake filter

hey guys, i just got a new filter for my short ram. its an injen tech. filter and the place i bought it from said injens r K/N bc theyre made by the same company. is this true? also after using the injen i thought it was incredible but then i tried a generic filter from ebay to see how itd compare and it actually seemed to work just as well. am i crazy, or isnt there spose to be a diff. between a $50 filter and a $7 generic???