K&N 33-2231

Replacement Filters > Replacement Air Filter
Rating Star 1 Rating Star 2 Rating Star 3 Rating Star 4 Rating Star 5   4.6 out of 5 stars   9 Customer Reviews
List Price: $74.06
Your Price: USD $50.99

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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 virtually every vehicle 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]
  • 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®

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)

Product Reviews

See all reviews!
Review part 33-2231
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
Saturday, August 22, 2015 - Part 33-2231
All of my cars have K&N filters you have excellent products and the service was great. It only took a couple of days for my filter to arrive and the fit was perfect.Thanks again I've always been happy with your products.

Nancy Vinroe
Sparks, Maryland
Tuesday, July 28, 2015 - Part 33-2231
Great product. Always makes. Difference. Shipping was BS FedEx sucks coming across the border. USPS is WAY better.

Thursday, July 16, 2015 - Part 33-2231
Installed perfectly and appears to be working well.

Ted Miles
Petaluma, CA
Monday, May 25, 2015 - Part 33-2231
Great product. It does improve performance on the car like it says it does. Installed on 2000 bmw 323i. Filter must be universal. It came with a gasket to line the upper part of the filter housing. Have to use that liner in addition to the filter to fit and work properly. K&N should not have used this liner and should have made made a direct fit. Hence, the 4 star. Saw the you tube on how to clean the filter. While drying time is needed, the car will be down. In order to keep the car running, I'll have to install the old type air filter. However I cannot install the old type air filter with that gasket in the way.

Monday, June 02, 2014 - Part 33-2231
Love it! This is clearly the best air filter money can buy for your car.

Jason A.
Paris, Kentucky
Monday, April 14, 2014 - Part 33-2231
The air filter works well in my son's BMW 330ix.

Mark Putnam
Orange, Virginia