I am talking from first hand experience. That little foam gasket on the end of your K&N falls apart and comes off over time. The problem is sometimes it does this and you don’t know it.... Sooooo you end up sucking all that good stuff into your motor :-/. This method also doesn’t allow you to run with out a lid; even with a stock filter this method is known to be flawed and allow debris in your motor if the filter isn’t seated EXACTLY right.