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K&N K&N Engine Air Filter: High Performance, Premium, Washable, Replacement Filter: 2003-2019 Subaru H4/H6 1.5/2.0/2.5/3.6L (Forester, Legacy, Outback, Impreza, WRX, Levorg, Crosstrek, Tribeca), 33-2304

38 Reviews
  • ULTIMATE LONGEVITY: 10-Year/Million Mile Limited Warranty protects for the life of your vehicle
  • ENGINEERED POWER: State-of-the-art filtration media provides up to 50% more airflow than disposable paper filters to increase power and acceleration. Clogged or dirty air filters can reduce your vehicle’s acceleration by up to 10%
  • EASY INSTALLATION: Pre-oiled and ready to drop into your factory air box. One of the easiest and most cost-effective upgrades for your vehicle for quick performance gains

$55.24

SKU:024844111562
  • ULTIMATE LONGEVITY: 10-Year/Million Mile Limited Warranty protects for the life of your vehicle
  • ENGINEERED POWER: State-of-the-art filtration media provides up to 50% more airflow than disposable paper filters to increase power and acceleration. Clogged or dirty air filters can reduce your vehicle’s acceleration by up to 10%
  • EASY INSTALLATION: Pre-oiled and ready to drop into your factory air box. One of the easiest and most cost-effective upgrades for your vehicle for quick performance gains
  • SAVES MONEY: K&N high-flow replacement air filters will save you 250 dollars over 10 years by avoiding disposable filters
  • ECO-FRIENDLY: Using a washable, reusable product helps reduce replacement waste. A K&N filter will last longer than 10 disposable filters
  • WORLD CLASS PROTECTION: Pushing the limits of engine protection by protecting your engine from harmful contaminants
  • LOW-MAINTENANCE DESIGN: 50,000 miles before your first cleaning under normal highway driving conditions
  • HIGH QUALITY: Made in America
Weight 0.89 lbs
Dimensions 10.438 × 1.75 × 11.563 in

Latest reviews

  1. Justin

    I really like K&N filters. I have had them in every car I own, thats several. I have one right now in my truck too. However, this Forester versions fitment was off. It was extremely difficult to install, and I am not talking about Subaru’s air box placement. It was like the filter was a little too big. I really had to force it in, and then the top bent down from the pressure. So there is a gap which is concerning.

  2. Michael

    I have always owned a K&N air filter for my various vehicles. From my truck to my car the K&N air filter provides high quality performance in any weather that is thrown at it. I live where all four seasons storm through each year and through the snow, rain, dust, and gravel roads my K&N filter has never let me down. Maintenance is simple and quick.

  3. Jeff

    Works great, and the engine certainly feels quicker on its toes! All valuable for the added strain of big roof loads. Had a K&N on my last ride too, and they really give you bang for the buck!

    The filter’s ridges don’t run the same direction as factory, and the filter is only almost square, so installation is tricky till you figure that out!

  4. Don

    The performance increase with this air filter was noticeable from the installation. What a difference! Cannot attest to any mpg increase as here in Oregon we cannot fill our own tanks or ask that they be filled beyond the click of the nozzle. This is my second experience with K&N filters and I am a believer in their products.

  5. Bryant

    Install couldn’t be easier. Post install there is noticable extra power when accelerating to pass at freeway speed. No figment of the imagination as my wife and dad also noticed (and didn’t know I put in a new filter). Getting an extra 3 miles per gallon highway haven’t noticed an increase in city MPG.

  6. Kyle

    I’m happy to have an air filter that doesn’t have to be thrown away every time I change my oil.  I haven’t noticed that I get better gas mileage but I do think it has increased the power slightly.  Either way the environmental aspect of having a K&N air filter is my favorite part.  It feels right 🙂

  7. Codiac273

    The K&N air filter is one if not the best. Used by NACAR in almost every vehicle. Every car I have ever owned for 20+ years I have purchased one, you won’t be disappointed. Adds hp, better than factory, clean or change every 30k, love it, it’s in all of my vehicles, always.

  8. DJ

    Don’t listen to my previous review.
    Filter fit right in once realizing the pleats don’t face the same way as the OEM filter. Grabbed some food and rotated the filter 90 degrees and wham, blam chicken & spam, she fit right in. Don’t recommend changing on an empty stomach.

  9. Joe

    Perfect fit and quality as usual. Definitely noticed a difference in acceleration from a stop immediately after installing. I’ve been using K&N filters in just about everything I’ve driven since I was 16, and recommend them to anyone that will listen!

  10. Shaun

    Great filter. So much better than the paper original. I get almost 10% better mileage over my old filter. Given that the old filter was fairly dirty this does not surprise me. Better engine response than before as well. A must have for your vehicle!

  11. John Blauvelt

    Make sure the filter is facing the correct way when installed. Watching a ton of YouTube videos caused me to second guess myself and will today get under the hood, pop the enclosure and double check I have the correct side facing incoming air flow

  12. Derrick

    Love the filter. Was in my 2016 Forester and now in my 2011 WRX(literally the same part number). The Forester ran a tad smoother and was great on gas and response. My WRX has it due to smog time, but it feels great. No complaints at all.

  13. Leonard

    Couldn’t believe how restrictive the original equipment air filter was . After installing the K&N replacement , the motor seems smoother and more responsive . The great gas mileage of my Subaru appears to have improved also .

  14. Will

    I put K&N filters in every vehicle I own and have never been disappointed. I immediately noticed an increase in power and just a smoother running engine. I also have been getting 34-35 mpg since I installed the air filter.

  15. DS

    Works great when you put it in the correct way. I had it turned to match the paper filter pattern folds I took out and it needed to be 90 degrees. It will go in the other way but you have to bend the edges in.

  16. Anonymous

    I have used K&N filters for years. I put one on my stock 3.6 Subaru Outback, and saw an immediate gain in mileage. It was a nice addition to the performance chip I just put in. She runs much stronger now!

  17. Ryan

    Man I dont know where to start here. This filter has not only added more HP but it also has increased my gas millage by 6.7mpg more. I’ll never again buy anything else.

  18. Bone city

    Other than than knowing it’s there because I put it in, it’s unnoticeable. But that’s the point, it will last a long time and I won’t have to worry about changing it.

  19. Lindsey

    Recieved product in under a week. For my Subaru it was as easy as unlocking the latches and replacing the filter. Seemed to already make a difference.

  20. Justin

    I really like K&N filters. I have had them in every car I own, thats several. I have one right now in my truck too. However, this Forester versions fitment was off. It was extremely difficult to install, and I am not talking about Subaru’s air box placement. It was like the filter was a little too big. I really had to force it in, and then the top bent down from the pressure. So there is a gap which is concerning.

  21. Michael

    I have always owned a K&N air filter for my various vehicles. From my truck to my car the K&N air filter provides high quality performance in any weather that is thrown at it. I live where all four seasons storm through each year and through the snow, rain, dust, and gravel roads my K&N filter has never let me down. Maintenance is simple and quick.

  22. Jeff

    Works great, and the engine certainly feels quicker on its toes! All valuable for the added strain of big roof loads. Had a K&N on my last ride too, and they really give you bang for the buck!

    The filter’s ridges don’t run the same direction as factory, and the filter is only almost square, so installation is tricky till you figure that out!

  23. Don

    The performance increase with this air filter was noticeable from the installation. What a difference! Cannot attest to any mpg increase as here in Oregon we cannot fill our own tanks or ask that they be filled beyond the click of the nozzle. This is my second experience with K&N filters and I am a believer in their products.

  24. Bryant

    Install couldn’t be easier. Post install there is noticable extra power when accelerating to pass at freeway speed. No figment of the imagination as my wife and dad also noticed (and didn’t know I put in a new filter). Getting an extra 3 miles per gallon highway haven’t noticed an increase in city MPG.

  25. Kyle

    I’m happy to have an air filter that doesn’t have to be thrown away every time I change my oil.  I haven’t noticed that I get better gas mileage but I do think it has increased the power slightly.  Either way the environmental aspect of having a K&N air filter is my favorite part.  It feels right 🙂

  26. Codiac273

    The K&N air filter is one if not the best. Used by NACAR in almost every vehicle. Every car I have ever owned for 20+ years I have purchased one, you won’t be disappointed. Adds hp, better than factory, clean or change every 30k, love it, it’s in all of my vehicles, always.

  27. DJ

    Don’t listen to my previous review.
    Filter fit right in once realizing the pleats don’t face the same way as the OEM filter. Grabbed some food and rotated the filter 90 degrees and wham, blam chicken & spam, she fit right in. Don’t recommend changing on an empty stomach.

  28. Joe

    Perfect fit and quality as usual. Definitely noticed a difference in acceleration from a stop immediately after installing. I’ve been using K&N filters in just about everything I’ve driven since I was 16, and recommend them to anyone that will listen!

  29. Shaun

    Great filter. So much better than the paper original. I get almost 10% better mileage over my old filter. Given that the old filter was fairly dirty this does not surprise me. Better engine response than before as well. A must have for your vehicle!

  30. John Blauvelt

    Make sure the filter is facing the correct way when installed. Watching a ton of YouTube videos caused me to second guess myself and will today get under the hood, pop the enclosure and double check I have the correct side facing incoming air flow

  31. Derrick

    Love the filter. Was in my 2016 Forester and now in my 2011 WRX(literally the same part number). The Forester ran a tad smoother and was great on gas and response. My WRX has it due to smog time, but it feels great. No complaints at all.

  32. Leonard

    Couldn’t believe how restrictive the original equipment air filter was . After installing the K&N replacement , the motor seems smoother and more responsive . The great gas mileage of my Subaru appears to have improved also .

  33. Will

    I put K&N filters in every vehicle I own and have never been disappointed. I immediately noticed an increase in power and just a smoother running engine. I also have been getting 34-35 mpg since I installed the air filter.

  34. DS

    Works great when you put it in the correct way. I had it turned to match the paper filter pattern folds I took out and it needed to be 90 degrees. It will go in the other way but you have to bend the edges in.

  35. Anonymous

    I have used K&N filters for years. I put one on my stock 3.6 Subaru Outback, and saw an immediate gain in mileage. It was a nice addition to the performance chip I just put in. She runs much stronger now!

  36. Ryan

    Man I dont know where to start here. This filter has not only added more HP but it also has increased my gas millage by 6.7mpg more. I’ll never again buy anything else.

  37. Bone city

    Other than than knowing it’s there because I put it in, it’s unnoticeable. But that’s the point, it will last a long time and I won’t have to worry about changing it.

  38. Lindsey

    Recieved product in under a week. For my Subaru it was as easy as unlocking the latches and replacing the filter. Seemed to already make a difference.

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