Are you the guy that I answered , guessing you were asking ‘bout oil filter ,haha! , sorry ! .... when you refer to air filter similar to K&N , I will assume you have checked them out and are comfortable with their filtering performance , K&N air filters cost more than others for a reason , if you believe what is written about their performance once dirty .... good luck !! , I use the UNI-sock type 2-layer foam filter as it is pliable and fits where you want it too ...