Not sure which 2009 Subaru Outback Air Filters - Custom Fit is right for you? We have over 14143 customer reviews, with an average rating of 4.5, to help you find exactly what you're looking for. Here's what some of our customers have said:
"I installed my K&n filter in a subaru outback and have noticed little to no difference in the stock filter but if you are going to keep your vehicle for a while I think it still pays because you don't have to replace it. There's nothing wrong with it that I can see, I just haven't seen any more power or mpg improvement. Maybe in different vehicles there may be a difference." —Jeffrey M from Houtzdale, PA bought a K&N Air Filters for a 2009 Subaru Outback.