Hi, I just changed my air filter from the stock nissan to a car quest replacement filter. I was wondering if there is any difference between these filters. (by air filter, I mean the airbox intake filter, not the in cabin filter) one question, does it matter which way it is put in. I only ask because I took out the old filter and didn't remember which way it was in. does it only go in 1 way? also, I'm thinking of adding an air intake, do these add any real benefit? does it increase/ decrease the gas mileage at all? thanks a lot in advance
-Slick Nick