This Perrin drop - in air filter is a must - have for Subaru WRX (2002 - 2007), STI (2004 - 2007), and Forester XT (2004 - 2008) owners. It features a 2 - stage foam filtration element that significantly boosts airflow in your stock air box. This means more power for your vehicle and better overall performance. The open - cell foam filter is excellent at removing harmful particles from the incoming air, keeping your engine clean. Installation is a breeze, taking only about 10 minutes. And with a 5 - year manufacturer warranty, you can have peace of mind. The foam filter uses a special oil coating to catch dirt while allowing air to flow freely. You can clean and re - oil it using the Perrin cleaning kit (sold separately).
Using this Perrin drop - in air filter is easy. First, make sure your vehicle's engine is off. Locate the stock air box and carefully open it. Remove the old air filter. Then, place the Perrin drop - in filter in the same position where the old filter was. Close the air box securely. That's it! For maintenance, every once in a while, check the filter's condition. If it looks dirty, you can use the Perrin cleaning kit (sold separately) to clean and re - oil it. When cleaning, follow the instructions on the cleaning kit. Store the filter in a dry place when not in use. And remember, this filter comes with a 5 - year manufacturer warranty, so if you have any issues, contact the manufacturer.
