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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   75 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.

[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, May 20, 2016 - Part 33-2304
I put a K&N in my 2004 Ford F150 FX4 right after I bought it. Nothing but great satisfaction with it. Averaged 22-24 mpg on the road. Not too shabby for a 4x4 with a 5.4ltr V8. The end of March, this year, I downsized to a 2016 Subaru Forester. Ordered a K&N the same day. Arrived in perfect condition and the car runs great. Have already noticed a pick up in power and better mpg than the factory states. I have nothing but great things to say about your product. Keep up the great work.

Joe Draugelis
Winchester, Virginia
Friday, May 20, 2016 - Part 33-2304
Good price and fast shipping. Easy to install.

Philip Wisniewski
Wednesday, May 18, 2016 - Part 33-2304
I've been using K&N products since 2006, and will continue to do so. I even have a radio controlled buggy equipped with a K&N filter. Easy to clean, re-oil, and get back to driving 8-)

Tuesday, May 17, 2016 - Part 33-2304
Ordered in Apr, delivered from California within a couple of days later (i.e., great). Purchased because I wanted a fresh filter for my 2014 Forester XT (2.0L/turbo) and couldn't easily get a paper OEM locally. What do I notice: Sounds like I'm getting a throater sound from the engine, and also can hear the turbine spin up. Fuel econ seems to have improved (10?). I don't drive it on a track or dyno, but accelerator feels a bit more responsive as well: packaging claims HP/torque benefits of ~+10-15 each ... I have no reason to doubt that. Good experience (even given the usual US-Can duty upcharge). I'd purchase again from K&N

Toronto, Canada
Tuesday, May 10, 2016 - Part 33-2304
Great product. Easy to install. Needs a Canadian shipping source to eliminate duty on parcels.

Milton, Ontario
Friday, May 6, 2016 - Part 33-2304
This is my second car equipped with air filter from K&N so far. Just can't go wrong there. It added a consistent half a mile to my gallon in a strictly city driving, stop and go, and sharp acceleration. To me this is huge as now I got Subaru Outback 3.6 2016 and that is one big engine for the traffic lights and my driving style. Thank you guys, for the difference you make.

Marian Yordanov
Friday, May 6, 2016 - Part 33-2304
This was extremely easy to install in my Subaru. I have three other K&N filters in PICKUPS. My 2000 F550 had the filter stolen off of the truck. What did I replace it with? A K&N, of course. I have two F250 one with 135000 miles and one with 180000 miles. They are very easy to service.

Bill Losey
Hays, Kansas