Keep your motor’s lungs fed with clean, energy-rich oxygen from the “the world’s best air filter”—K&N Air Filters. Constructed from pleated sheets of oiled cotton gauze, these air filters strip away grime without blocking airflow. Fully reusable. Million Mile Limited Warranty.
Say goodbye to the days of re-oiling your reusable performance filter—innovative aFe Pro-Dry S Air Filters boast a 100% oil-free cotton gauze construction for wicked airflow. Easy to clean and reuse. The Pro-Dry S Air Filter is backed by a Lifetime Warranty.
Put to rest the ghosts of paper air filters past by exorcizing your air system with a Spectre Air Filter. Masterfully constructed from pleated cotton gauze, these performance air filters trap dirt while still allowing energy-rich air to blast through. Reusable. Lifetime Warranty.
Get maximum filtration with the Airaid SynthaMax Air Filter. Featuring 5 layers of non-oiled, 100% synthetic fiber, this reusable air filter directly replaces your factory paper filter with no modifications. Washable in household detergent and reusable for life. Lifetime Warranty.
When you equip your engine bay with an aFe Air Filter, you’ll never need another performance air filter in your ride’s life. aFe expertly crafts your automotive air filter from high-quality cotton gauze to trap grime without blocking airflow. Cleanable and reusable. Lifetime Warranty.
Drop in optimal engine filtration and performance with the Airaid SynthaFlow Air Filter. Replacing flimsy factory paper filters, this high-performance filter combines multiple oiled cotton gauze and synthetic fiber layers to deliver ultimate airflow and protection. Lifetime Warranty.
Not sure which 2004 Subaru Forester 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:
"Adding this filter is a cheap mod that will probably squeeze a few more horsepower out of the Turbo XT" —Denis N M from Richmond, CA bought a K&N Air Filters for a 2004 Subaru Forester.
"I can hear the car breeth easier, it also improved my horsepower and miliage." —Matthew D from Usaf Academy, CO bought a K&N Air Filters for a 2004 Subaru Forester, 2.5L 4-cyl. turbocharged engine.
"This K&N filter gives my car a little more pickup, but best it saves me money. The dealer that changes my oil wants $25 per filter. This will last a lomg time at no additional cost. A real bargin." —David H from Queen Creek, AZ bought a K&N Air Filters for a 2004 Subaru Forester.
"My first K&N filter. Got a great price from Auto Anything, car now seems to have a bit more power, can hear turbo spool up better and can even hear BOV. Awesome." —Bill M from Baltimore, MD bought a K&N Air Filters for a 2004 Subaru Forester, 2.5L 4-cyl. turbocharged engine.
"With the price of gasoline getting higher and higher.......I feel a greater need to take proactive steps to make sure my vehicle is running as efficiently as possible. I believe that the addition of this filter is BIG step in the right direction." —Richard D from Albuquerque, NM bought a K&N Air Filters for a 2004 Subaru Forester.