K&N High-Flow air filter ready for Subaru installation.
K&N filter media close-up showing four-layer cotton gauze.
Durable construction highlighting premium materials for long-lasting performance.
Rugged, ruggedly built filter material and housing for life.
Easy drop-in installation into the factory air box.
Filter fits Subaru factory air box with precise fitment.
Reusable design emphasizes eco-friendly, washable filtration.
Made in the USA quality and reliability from K&N.
Warranty badge and long-term coverage for peace of mind.
K&N High-Flow air filter ready for Subaru installation.
K&N filter media close-up showing four-layer cotton gauze.
Durable construction highlighting premium materials for long-lasting performance.
Rugged, ruggedly built filter material and housing for life.
Easy drop-in installation into the factory air box.
Filter fits Subaru factory air box with precise fitment.
Reusable design emphasizes eco-friendly, washable filtration.
Made in the USA quality and reliability from K&N.
Warranty badge and long-term coverage for peace of mind.

K&N High-Flow Original Lifetime Engine Air Filter 33-2304 for Subaru (2003-2021) – Premium, Washable

The K&N High-Flow Original Lifetime Engine Air Filter 33-2304 is engineered to help your engine breathe easier,...
Vendor: K&N
Availability: In stock
£73.03
£73.03
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Subtotal: £73.03
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K&N High-Flow air filter ready for Subaru installation.

K&N High-Flow Original Lifetime Engine Air Filter 33-2304 for Subaru (2003-2021) – Premium, Washable

£73.03
K&N High-Flow air filter ready for Subaru installation.
K&N filter media close-up showing four-layer cotton gauze.
Durable construction highlighting premium materials for long-lasting performance.
Rugged, ruggedly built filter material and housing for life.
Easy drop-in installation into the factory air box.
Filter fits Subaru factory air box with precise fitment.
Reusable design emphasizes eco-friendly, washable filtration.
Made in the USA quality and reliability from K&N.
Warranty badge and long-term coverage for peace of mind.

K&N High-Flow Original Lifetime Engine Air Filter 33-2304 for Subaru (2003-2021) – Premium, Washable

£73.03
Description
Description
x

The K&N High-Flow Original Lifetime Engine Air Filter 33-2304 is engineered to help your engine breathe easier, delivering smoother throttle response and robust protection for a broad range of Subaru models from 2003 to 2021, as well as select other vehicles listed in the description. With its washable design, this filter is built to last the life of your vehicle, reducing waste and offering a convenient upgrade to your factory air box.

Performance and durability

  • State-of-the-art air filter media is designed to increase horsepower and acceleration while improving overall engine performance.
  • Rugged construction uses premium materials and modern manufacturing methods to last a lifetime.
  • 4 layers of protection crafted from premium cotton gauze with a special tacking agent to trap contaminants effectively.
  • Washable and reusable, reducing replacement waste and keeping maintenance costs lower over time.
  • Easy installation: pre-treated and ready to drop into your factory air box for a quick upgrade.

Everyday use and warranty

  • Engineered to fit easily into your factory air box and complete in minutes, with no drilling or tools required.
  • No-hassle lifetime warranty on stock replacement filters for trusted durability.
  • Made in the USA with tested performance on some of the world’s toughest race tracks before reaching your driveway.
  • Eco-friendly design reduces landfill waste by replacing disposable filters with a washable alternative.
  • Maintenance interval: clean about every 75,000 miles under normal highway driving conditions.

In daily driving, the filter aims to offer crisp throttle response, smoother acceleration, and a steady air supply to the intake. While results can vary by vehicle and conditions, this upgrade is presented as a possibility for drivers seeking a long-lasting, reusable filtration solution.

FAQ

Q: Which vehicles are compatible with the K&N 33-2304 air filter?

A: Fits select Subaru models from 2003–2021 and a few other listed vehicles; check the product description for exact fitment.

Q: How often should you clean the K&N air filter?

A: Clean roughly every 75,000 miles under normal highway driving conditions.

Shipping & Return
Shipping & Return
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Returns Policy

You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).

You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).

If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.

Shipping

We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.

When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.

Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.

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