If you don't get a pro-flow adapter for the airbox, you are going to get sand and debries past the filter no matter what. If you do have a proflow adapter make sure you don't tighten bolts too tight into plastic airbox, it will create a recess on the bolt holes, and adapter plate will not seal well to airbox and you will get dirt in that way(dont' ask how I know that ). Once I got all that straight, k+n has never failed me as long as you keep it "charged"(oiled) and I run no lid.