Reviewed By Dennis B (Southlake, TX) Reviewed for a 2002 Mercury Cougar —3/21/2012 3:58 AM
I installed the K&N replacement filter in my wife's car without telling her to see if there were any noticeable improvements. After 4 weeks I told her I replaced the air filter and did she notice any changes. She told me there were no noticable change in performance (I drove the car and agree with her), but after 4 tankfulls of gas there was a slight improvement in gas mileage(.5 MPG). Well, at least we won't be putting any more paper filters in the landfill. My other vehicles (2 trucks) have the K&N cold air intake kits and you do notice a performance improvement. So if you want noticeable performance improvements I would recommend installing one of the intake kits not just a filter replacement.