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K&N 33-2304 Air Filter

Replacement Filters > Replacement Air Filter
Rating Star 1 Rating Star 2 Rating Star 3 Rating Star 4 Rating Star 5   4.9 out of 5 stars   161 Customer Reviews
  • Designed to boost horsepower and rate of acceleration
  • Can be cleaned and used again
  • High air flow with exceptional filtration
  • Lasts up to 50,000 miles before cleaning is required depending on driving conditions
  • Works with original equipment manufacturer vehicle electronics
  • Emissions legal in all 50 US states
  • Will NOT void vehicle warranty
  • Million Mile Limited Warranty®
The K&N 33-2304 Air Filter fits some Chrysler 300C, Lancia Thema, Subaru B9 Tribeca, Subaru Crosstrek, Subaru Exiga, Subaru Forester, Subaru Forester Turbo, Subaru Impreza, Subaru Impreza II, Subaru Impreza II WRX, Subaru Impreza II WRX STI, Subaru Impreza III, Subaru Impreza III WRX STI, Subaru Impreza WRX, Subaru Impreza WRX STi, Subaru Legacy, Subaru Legacy GT, Subaru Legacy III, Subaru Legacy IV, Subaru Levorg, Subaru Liberty, Subaru Liberty Exiga, Subaru Outback, Subaru Outback II, Subaru Outback III, Subaru Outback XT, Subaru Tribeca, Subaru WRX, Subaru WRX STI, Subaru XV, and Subaru XV Crosstrek models. See vehicle applications link for details.
K&N's replacement air filters are designed to increase horsepower and acceleration while providing excellent filtration. We make over 1,200 different replacement air filters for the majority of vehicles on the road. These filters are washable and reusable and are custom designed to fit into your existing factory air box. Their drop-in design means adding performance is simple. With most vehicles you simply remove the disposable air filter and replace it with a K&N. See applicable instruction sheet for details. Our stock replacement air filters for street vehicles are covered by our famous K&N Million-Mile Limited Warranty and will be the last air filter your vehicle will ever need.

[More Information on K&N Replacement Air Filters]

Product Specifications

Air Filter ShapePanel
Filter MaterialCotton Gauze
Height0.938 in (24 mm)
Outside Length8.75 in (222 mm)
Outside Width8.563 in (217 mm)
Package Contents1 Air Filter
Package Quantity1
Product StylePanel Air Filter
Weight0.9 lb (0.4 kg)
Filter Re-Oiling Amount1.06 oz (31 ml)
Product Box Height11.56 in (294 mm)
Product Box Length10.44 in (265 mm)
Product Box Width1.75 in (44 mm)

K&N 33-2304 Air Filter Product Reviews

Tuesday, March 20, 2018 - Part 33-2304
K&N Filters are my go to air filters. They last a really long time if you take care of them and clean them properly. Worth the $$$.

Tiffany Duran
Scio, Oregon
Friday, March 9, 2018 - Part 33-2304
Was at my door in 2 days. Easy to install. Nothing bad to say about it great product thank you K&N.

Stéphane Auger
Québec, Canada
Thursday, March 8, 2018 - Part 33-2304
Love it . I enjoy my car now...

Trieu Doan
Montreal, Canada
Tuesday, January 30, 2018 - Part 33-2304
Slid right in for a perfect fit. Always quality products. You can hear the Subie take the better breathe.

Kyle Talley
North Richland Hills, Texas
Monday, January 29, 2018 - Part 33-2304
Perfect fit. Better mileage than stock filter.

Neil Spaulding
Silverthorne, Colorado
Tuesday, January 23, 2018 - Part 33-2304
Fits and came quickly.

Michael Vint
El Cajon, California
Friday, December 22, 2017 - Part 33-2304
I have been a K&N user for many years. In 1986 I purchased my first K&N for my 86 Ford F250 Diesel, then my 2007 Honda Ridgeline, 2012 Subaru Outback and most recently our 2017 Subaru Outback. I have OUTSTANDING service from all my K&N products.

Byron Muck
Marysville, Washington