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33-2304
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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   118 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 WRX, Subaru Impreza WRX STi, Subaru Legacy, Subaru Legacy GT, Subaru Legacy IV, Subaru Levorg, Subaru Liberty, Subaru Liberty Exiga, Subaru Outback, 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

Friday, February 10, 2017 - Part 33-2304
I have resisted buying a K&N filter for awhile thinking that I would just replace the regular filter at the necessary intervals and not worry about the washing. I figured the performance gains probably weren't worth the trouble. I couldn't have been more wrong. I'm not sure if I picked up any horsepower but the driveablity improved tremendously. Even when the the car was brand new there was a lot of turbo surge and some stuttering at full on throttle. It only got worse as the factory filter got dirtier. With the K&N, there was no stuttering and the turbo surge was much more controlled and progressive. The car is so much more fun drive. And that's why I bought a WRX to begin with.

Pat
Salt Lake City, Utah
Monday, January 30, 2017 - Part 33-2304
I like that the air filter that can be cleaned and reused. Gas mileage is up 1-2 mpg. It will pay for itself over time.

Katherine Davis
Coraopolis, Pennsylvania
Saturday, January 28, 2017 - Part 33-2304
Have purchased a dozen or so for cars, trucks and motorcycles in last 30 years. Always the same: perfect fit, easy install and instant gratification in the form of either better performance or fuel economy improvement. You never know which it will be, but something will improve tangibly. You just can't lose, and it always makes me smile.

William Mackan
College Station, Texas
Tuesday, January 17, 2017 - Part 33-2304
Works great and easy to install on Subaru Outback 2015-2017.

Christopher Mahon
Charleston, South Carolina
Friday, January 6, 2017 - Part 33-2304
To early to tell if the claims of increased HP and mileage are accurate. Have a K&N filter in my 2003 Honda Pilot with 223,000 on vehicle. Put in at 197k and gas mileage is 18+ . 21 highway.

Karl Rentzheimer
Laurys Station, Pennsylvania
Monday, December 26, 2016 - Part 33-2304
Easy installation. Great product.

Joseph Boyle
Goshen, Arizona
Monday, December 12, 2016 - Part 33-2304
Received my filter very quickly and installed it the first chance I got. I now have K&N filters in my Honda S2000, my Saab 9.3 turbo convertible and now my Subaru Legacy 3.6R.

Samuel Sasson
Ocean, New Jersey