Review on K&N Engine Air Filter 33-2154: High Performance, Washable Replacement Filter for 1996-2008 Subaru (Impreza, Forester, Legacy, Outback, and more) by Carlos Long

I replaced my old paper filter right after I bought a 2003 Subaru Forester. One K&N filter costs about the same as four paper filters, giving a K&N payback period of less than two years. Not to mention the slightly better performance you'd expect from more airflow. After installing this filter I noticed a smoother overall power delivery from my 2.5. Price combined with performance is a winning combination. This is my third K&N that I have bought and I have never had a single problem with any of them. The filter fits perfectly. I would recommend an air filter to anyone on the market.