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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   66 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
Height1.25 in (32 mm)
Outside Length13.688 in (348 mm)
Outside Width5.188 in (132 mm)
Package Contents1 Air Filter
Package Quantity1
Product StylePanel Air Filter
Weight0.9 lb (0.4 kg)
Filter Re-Oiling Amount1.21 oz (36 ml)
Product Box Height17.19 in (437 mm)
Product Box Length8.31 in (211 mm)
Product Box Width1.75 in (44 mm)

K&N 33-2181 Air Filter Product Reviews

Tuesday, December 12, 2017 - Part 33-2181
I may have missed it, but it would have been nice if you told me it needed TWO at the time of purchase.

David Carter
Gaithersburg, Maryland
Thursday, November 30, 2017 - Part 33-2181
I always service my cars with K&N air filters, and oil filters in the correct oil for the cars. Because of this, I only need to change the oil every two years which saves time and money. There oiled filters are the only ones which do not rattle apart from the Mercedes, which cost more money and you would have to change the oil every year. If I keep car for six years this ends up so give me about £500 it’s a no-brainer K&N all the way.

David Cerioli
Inverness, United Kingdom
Friday, November 17, 2017 - Part 33-2181
Used two filters on my 2010 benz e350 4matic, car runs better, better acceleration and mpgs went from 24.5 to 26.0 at 72mph, very satisfied with the product. Thanks Recommended 100%

Darek Zawrzykraj
South Holland, Illinois
Monday, September 11, 2017 - Part 33-2181
I use K&N filters on all my cars. When it was time to change filters in my wife's GLK 350, I knew what I needed to do. Ordered 2 filters from your company. Installation was easy and I never have to buy a filter again.

Thomas Harris
Anthem, Arizona
Wednesday, August 30, 2017 - Part 33-2181
Great products and service.

Northumberland, United Kingdom
Thursday, July 27, 2017 - Part 33-2181
I Have K&N filters on all my vehicles (2010 KIA Soul Sport, 2009 Mercedes C 300, 2005 Mazada Tribute and a 2009 F250 Lariat 6.2 Diesel). Put a K&N air kit on my 2009 F250 and increased MPG and Torque . Filters are higher quality than stock and with the K&N filter kit I can keep clean air to the motor. A great purchase that is worth every penny.

Jeremy Willingham
Childersburg, Alabama
Tuesday, July 11, 2017 - Part 33-2181
Great all around.

Randall Strey
Seguin, Texas