$47.99 USD
MSRP $74.99 36.0% Off
Free Ground Shipping!
In Stock & Ready to Ship!
Find a Dealer

K&N 33-2181 Air Filter

Replacement Filters > Replacement Air Filter
Rating Star 1 Rating Star 2 Rating Star 3 Rating Star 4 Rating Star 5   5.0 out of 5 stars   49 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 Amount1.21 oz (36 ml)
Height1.25 in (32 mm)
Outside Length13.688 in (348 mm)
Outside Width5.188 in (132 mm)
Package Contents1 Air Filter
Package Quantity1
Product Box Height17.19 in (437 mm)
Product Box Length8.31 in (211 mm)
Product Box Width1.75 in (44 mm)
Product StylePanel Air Filter
Weight0.9 lb (0.4 kg)

K&N 33-2181 Air Filter Product Reviews

Thursday, October 6, 2016 - Part 33-2181
Typical K&N quality and performance. I recommend buying 2... one to swap and the other to always have clean and ready...

Kenneth Sanchez
Spring, Texas
Wednesday, September 21, 2016 - Part 33-2181
Fast service and packaging size was sized properly. The filters fit like a glove.

Gregory G Frazer
Boerne, Texas
Saturday, September 3, 2016 - Part 33-2181
Just another great filter system for my Mercedes Benz 2002 S500. All three of my cars have K&N filters. 89 5.0 LX Sport Mustang and my 2004 F150 FX4. Mustang and F150 both have K&N induction kits. K&N forever baby. Oh, say hello to Kevin M. I used to work at (Brand Name). Kevin ran the dyno and R&D departments.

Robert Mckinzie
Novato, California
Monday, August 29, 2016 - Part 33-2181
Good product. Easy installation. Who needs to be over charged at the dealership.

Dan Lahey
Laguna Niguel, California
Monday, August 22, 2016 - Part 33-2181
Love these filters! I can tell a difference in performance, especially when I use sport mode.

La Quentin Platt
Orlando, Florida
Wednesday, August 17, 2016 - Part 33-2181
Every car I purchase one of the first performance upgrades I do is, I remove and replace the air filter(s) with K&N. From the shipping to the instructions, its very simple and effective. I installed these air filters on my 2007 MB C280 4matic and went on a trip last week. I had 2 mpg difference. I do have to admit, the air filters that were replaced appeared to me to be the wrong ones. They looked to be too big and consumed the entire cavity. Compared to the OE Filters, the K&N is hardly noticeable (I have pictures because it was such a difference but I can not upload them so if a K&N rep is reading this please feel free to contact me and I will send them). The car sounds better as well.

Mr. Vincent White
Olney, Maryland
Wednesday, August 17, 2016 - Part 33-2181

Claudio Chersich
Englewood Cliffs, New Jersey