Hero image 0 of 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, 0 of 3
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
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Key item features
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
- 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-treated 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 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:
- RACE TESTED: The Official Air Filter of NASCAR. Trusted on the racetrack—made for your vehicle.
Specs
- Manufacturer part number33-2304
- Vehicle makeSubaru, Lancia
- Vehicle year2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2021
- BrandK&N
- Engine air filter typeGauze
- Vehicle fitment typeSpecific
Current price is USD$56.99
Price when purchased online
- Free shipping
Free 30-day returns
How do you want your item?
Columbus, 43215
Arrives by Mon, May 4
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Sold and shipped by K&N|Pro Seller
4.765486725663717 stars out of 5, based on 226 seller reviews(4.8)226 seller reviews
Free 30-day returns - in store or online
Other sellers
$68.99
+Free shippingShipping, arrives by tomorrow to Columbus, 43215
Sold and shipped by Walmart.com
Free 90-day returns
About this item
Product details
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 K&N performance High-Flow Air Filters are engineered to improve engine performance by increasing airflow up to 50%. Unlike disposable paper filters which must be frequently replaced, K&N Air Filters are washable, reusable, and engineered to last for the life of your vehicle. K&N air filters are backed by our famous 10-Year/Million Mile Limited Warranty, and they provide an environmentally friendly way to reduce landfill waste by avoiding disposable filters. Engineered to fit easily into your factory air box, installation can be completed in a matter of minutes! K&N develops and tests each product on the world’s toughest race tracks, so we can bring the highest level of performance to your daily driving. Join the millions of customers who have saved money and improved vehicle performance by upgrading to K&N filtration. Vehicle Fitment: 2008-2019 SUBARU Forester; 2005-2019 SUBARU Legacy; 2014-2019 SUBARU Levorg; 2004-2019 SUBARU Outback; 2012-2019 SUBARU WRX; 2012-2018 SUBARU WRX STI; 2017 SUBARU Crosstrek; 2008-2017 SUBARU Exiga; 2003-2017 SUBARU Liberty; 2012-2017 SUBARU XV; 2008-2016 SUBARU Impreza; 2008-2016 SUBARU Impreza WRX STi; 2013-2016 SUBARU XV Crosstrek; 2011-2015 LANCIA Thema; 2008-2014 SUBARU Impreza WRX; 2003-2014 SUBARU Legacy IV; 2009-2014 SUBARU Liberty Exiga; 2005-2014 SUBARU Tribeca; 2011-2012 SUBARU Forester Turbo; 2003-2010 SUBARU Legacy III; 2007-2009 SUBARU Impreza II; 2005-2009 SUBARU Legacy GT; 2009 SUBARU Outback III; 2007-2008 SUBARU Impreza II WRX; 2007-2008 SUBARU Impreza II WRX STI; 2008 SUBARU Impreza III; 2008 SUBARU Impreza III WRX STI; 2003-2008 SUBARU Outback II; 2006-2007 SUBARU B9 Tribeca; 2005-2006 SUBARU Outback XT
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
- 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-treated 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 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:
- RACE TESTED: The Official Air Filter of NASCAR. Trusted on the racetrack—made for your vehicle.
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Specifications
Manufacturer part number
33-2304
Vehicle make
Subaru, Lancia
Vehicle model
Legacy, Outback, Forester, Impreza WRX, Tribeca
Vehicle year
2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2021
Directions
Fabric Care Instructions
Yes
Warranty
Warranty information
LIMITED LIFETIME REPLACEMENT
Please be aware that the warranty terms on items offered for sale by third party Marketplace sellers may differ from those displayed in this section (if any). To confirm warranty terms on an item offered for sale by a third party Marketplace seller, please use the 'Contact seller' feature on the third party Marketplace seller's information page and request the item's warranty terms prior to purchase.
Please be aware that the warranty terms on items offered for sale by third party Marketplace sellers may differ from those displayed in this section (if any). To confirm warranty terms on an item offered for sale by a third party Marketplace seller, please use the 'Contact seller' feature on the third party Marketplace seller's information page and request the item's warranty terms prior to purchase.
Warranty url
Warnings
WARNING: WARNING: This product contains chemicals known to the State of California to cause cancer andbirth defects or other reproductive harm.Similar items you might like
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Customer ratings & reviews
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Showing 1-3 of 91 reviews
Dec 8, 2025
Gary
5 out of 5 stars review
Verified Purchase
This is worth every penny. I would recommend this for any car. The horsepower increase is quite noticeable as well.
Incentivized Review
Helpful?3H5V94PZGF6V34814098
Jul 20, 2022
DJ
5 out of 5 stars review
Seller Verified Purchase
Super Easy
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.
Review from K and N Filters
Helpful?3H5V94PZGF6V34814098
Apr 1, 2025
Subi Sue
5 out of 5 stars review
Great Addition to Upgrades
My son and I could tell the increase in the engines throttle response, and an increase in power. It is not huge as one would expect with just an air filter change from OEM, but it does have a noticeable improvement in power. I'm guessing but I estimate maybe 5 Hp increase.
Review from K and N Filters
Helpful?3H5V94PZGF6V34814098
