Reviewed By Brian K (Greensboro, NC) Reviewed for a 2008 Subaru Impreza —7/3/2012 6:48 PM
I have K&N filters on all my vehicles. I just put one on my new(for me) 2008 WRX Sti. Lets the car breath better. I tend to keep my vehicles for a long time. It will certanly pay for itself. I put it on as soon as I puchesed the car so I can't speak to a mpg gain, but K&N filters have given me a 1-2 mpg gain on my other vehicles (and a little performance boost too)so I guess this application would be no different.