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33-2181
$49.99 USD
MSRP $76.89 35.0% Off
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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   70 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
Warranty1,000,000 Miles/10 Year
Product StylePanel Air Filter
Weight0.9 lb (0.4 kg)
Filter Re-Oiling Amount1.21 oz (36 ml)
Product Box Height1.75 in (44 mm)
Product Box Length17.19 in (437 mm)
Product Box Width8.31 in (211 mm)

K&N 33-2181 Air Filter Product Reviews

Tuesday, June 19, 2018 - Part 33-2181
Great product, I have been using K&N filters on all my vehicles.

Phong Nguyen
Kitchener, Canada
Thursday, May 24, 2018 - Part 33-2181
Immediate improvement and sounds better.

Daniel Cullen
Austin, Texas
Monday, May 7, 2018 - Part 33-2181
There was initially some confusion on the shipment and where it was going to but Customer Service was able to confirm that delivery was going to the correct location. As far as the filters [yes, Mercedes 300 required 2 air filter elements) I can feel the difference in acceleration and my mileage has increase about 1.5 mpg compared to stock. Worth the price I have K&N air filters in my cars for over ten years and will continue to do so.

Mark Phillips
Virginia Beach, Virginia