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33-2231
$48.99 USD
MSRP $75.59 35.2% Off
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K&N 33-2231 Air Filter

Replacement Filters > Replacement Air Filter
Rating Star 1 Rating Star 2 Rating Star 3 Rating Star 4 Rating Star 5   4.7 out of 5 stars   15 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 oz (30 ml)
Height1.063 in (27 mm)
Outside Length9.375 in (238 mm)
Outside Width6.875 in (175 mm)
Package Contents1 Air Filter
Package Quantity1
Product Box Height9.69 in (246 mm)
Product Box Length7.72 in (196 mm)
Product Box Width1.75 in (44 mm)
Product StylePanel Air Filter
Weight0.8 lb (0.3 kg)

K&N 33-2231 Air Filter Product Reviews

Monday, February 15, 2016 - Part 33-2231
Fast delivery and slight throttle response increase. Well made.

Sam
Devon, United Kingdom
Monday, February 8, 2016 - Part 33-2231
Super Service, Superb Product Vic

Vic Pena
Charlottesville, Virginia
Wednesday, February 3, 2016 - Part 33-2231
I am very pleased with the product....still new to me but I have heard a lot of good thing from friends and comments on the website.

Gilberto Carrizales
Neptune Beach, Florida
Monday, December 14, 2015 - Part 33-2231
Thanks for getting the filter to me quick. It fit great and easy to install with the excellent directions. Keep up the good work.

Richard Largen
Illinois
Tuesday, November 24, 2015 - Part 33-2231
I found filter easy to fit and feel it has improved performance power of my bmw 320i family members have used k@n and do recommend buying one

Gerald Cullen
Edinburgh
Sunday, October 11, 2015 - Part 33-2231
I've used K&N in most of my vehicles. Easy to install, and easy to clean. Love their products.

David
Kentucky
Thursday, September 17, 2015 - Part 33-2231
Great product, we put stock k&n filters in all our BMW's for more than 15 years now.

Travis Knotts
Petersburg, Virginia