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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   106 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®
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.

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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, October 21, 2016 - Part 33-2304
Quick delivery, well packaged and easy to fit. Instructions are simple but do the job.

Graeme Higgins
Bristol, United Kingdom
Thursday, October 20, 2016 - Part 33-2304
Perfect fit in a 2012 Suby Forester 3.6. Usual K&N quality, and rapid service.

Nicolas Cornelius
Phoenix, Arizona
Saturday, October 1, 2016 - Part 33-2304
I noticed an immediate boost to acceleration and get higher speeds from the top end of the revs. If there is a boost to fuel economy I haven't noticed but this could be because I'm taking it to the red line almost everywhere. Yes, I would buy these in the future for any car I own.

David Jensen
Leicester, United Kingdom
Tuesday, September 27, 2016 - Part 33-2304
Perfect fit for my Subaru.

Mike Saluto
Temple, Texas
Sunday, September 25, 2016 - Part 33-2304
I got it for my 2015 Impreza 2.0i (manual) because I wanted the best mileage possible from it. I installed it after the 124 mile trip from the dealership (arrived same day as the car), so basically from the beginning. I average 33mpg with 40 highway and depending how aggressive I drive 28+ city. It's awesome, mpg and awd are why I got the car and not a wrx. Great product. Definitely will buy again.

T. Holley
Monday, September 19, 2016 - Part 33-2304
Great online service, and felt an increase after 2nd gear immediately after drop in install.

Robert Stauring
Hatfield, Pennsylvania
Tuesday, September 13, 2016 - Part 33-2304
Great product, I have them in all my vehicles.

Michael Elkavitch
Dublin, New Hampshire