I've been using Stockkkkkkkk filters for about 50 years. I would like to add that I have never had ANY AIR FILTER RELATED ENGINE ISSUE with any of my cars (43 cars in all) of both American and foreign manufacture.
Ok K&N lets put the idea of any Hp gains out of heads here
and think about just saving wear and tear on the motor
I living in az a place full of sand /dust and dirt would rather have the K&N in my car
why you ask?
because the Oil helps trap more dirt and to be honest the less dirt that gets into your motor the longer its going to last..
plus if you buy the K&N it will last for a loong time and if you buy 5 stock air fillters for you Koup you just paid for the K&N..
why not add a extra level of defence for your motor??
I'm Just saying *SMILES*