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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   125 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 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
Filter Re-Oiling Amount1.06 oz (31 ml)
Height0.938 in (24 mm)
Outside Length8.75 in (222 mm)
Outside Width8.563 in (217 mm)
Package Contents1 Air Filter
Package Quantity1
Product Box Height11.56 in (294 mm)
Product Box Length10.44 in (265 mm)
Product Box Width1.75 in (44 mm)
Product StylePanel Air Filter
Weight0.9 lb (0.4 kg)

K&N 33-2304 Air Filter Product Reviews

Thursday, April 13, 2017 - Part 33-2304
Been a regular customer, always be back.

John McCarthy
Rowley, Massachusetts
Wednesday, March 22, 2017 - Part 33-2304
Have been using knfilters for over 35 years and never have been disappointed.

John Pappas
Billerica, Massachusetts
Tuesday, March 14, 2017 - Part 33-2304
Easy install into my 2015 Subaru Crosstrek XV.... expected power and performance. Thanks for a great product.

Timothy Tilley
Sierra Vista, Arizona
Friday, March 3, 2017 - Part 33-2304
Instant 2 MPG increase and I drive 100 mile round trip to work each day.

Timothy McMenamin
Hopewell Junction, New York
Thursday, March 2, 2017 - Part 33-2304
Got filter quickly. Haven't put it in yet. Near the end of my ordering on line process, it wasn't clear whether my order had been placed or not. The confirmation e-mail you sent me confirmed it though. Check it out, as it was a bit confusing. Maybe it was just me?? Best wishes, Ron

Ronald Kersey
North Las Vegas, Nevada
Monday, February 20, 2017 - Part 33-2304
Instantly a benefit for my 08 Subaru wagon with dual split exhaust, actually helps in that regard. Made sense to trust a K&N air filter.

Robert Baybutt
Henrico, Virginia
Friday, February 17, 2017 - Part 33-2304
Easy install. I think it has increased my exceleration and mileage.

Harvey Libow
Savannah, Georgia