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K&N®
K&N Performance Air Filter - Premium Lifetime, Washable, Replacement Filter - 33-2231

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$64.99
Manufacturer #33-2231
Vehicle Info Required to Guarantee FitAdd Vehicle
Qty:
1

Highlights

Brand:
Style:
Oiled
Type:
Reusable
Series:
33 Series
Recommended Use:
Performance Replacement
Quantity Sold:
Sold individually
Warranty:
10-year or 1 million-mile K&N limited warranty
Prop 65 Warning:

Warning SymbolWARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Promotions:
Fall Car Care Month
Filtration Efficiency Rating:
96 to 99%

Vehicle Fitment Information

Vehicle Name
Submodel
Engine
Fitment Information
1999 BMW 318i
Base
4 Cyl 1.9L
-
1999 BMW 318ti
Base
4 Cyl 1.9L
-
1999 BMW 323i
Base
6 Cyl 2.5L
E46 Body
2000 BMW 323Ci
Base
6 Cyl 2.5L
-
2000 BMW 323i
Base
6 Cyl 2.5L
-
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Product Information

K&N ENGINE AIR FILTER

K&N performance High-Flow Air Filters are engineered to improve engine performance by increasing airflow up to 50%. Unlike disposable paper filters which must be frequently replaced, K&N Air Filters are washable, reusable, and engineered to last for the life of your vehicle. K&N air filters are backed by our famous 10-Year/Million Mile Limited Warranty, and they provide an environmentally friendly way to reduce landfill waste by avoiding disposable filters. Engineered to fit easily into your factory air box, installation can be completed in a matter of minutes! K&N develops and tests each product on the world’s toughest race tracks, so we can bring the highest level of performance to your daily driving. Join the millions of customers who have saved money and improved vehicle performance by upgrading to K&N filtration.

  • Engineered power: State-of-the-art filtration media provides up to 50% more airflow than disposable paper filters to increase power and acceleration; clogged or dirty air filters can reduce your vehicle’s acceleration by up to 10%
  • Easy installation: Pre-oiled and ready to drop into your factory air box; one of the easiest and most cost-effective upgrades for your vehicle for quick performance gains
  • Saves money: K&N high-flow replacement air filters will save you $250 over 10 years by avoiding disposable filters
  • Eco-friendly: Using a washable, reusable product helps reduce replacement waste; K&N filter will last longer than 10 disposable filters
  • World class protection: Pushing the limits of engine protection by protecting your engine from harmful contaminants
  • Low-maintenance design: 50,000 miles before your first cleaning under normal highway driving conditions
  • High quality: Made in America
  • Race tested: The Official Air Filter of NASCAR; trusted on the racetrack—made for your vehicle

Started in 1969, K&N has garnered a reputation for engineering the world’s finest filtration products for cars, trucks, SUVs, motorcycles, race vehicles, commercial vehicles and anything in-between.

Need help?Call our product expert1-866-529-0412
Chat with us
Mondays - Sundays7am - 11pm ET | 4am - 8pm PT
Warranty Policy
Right parts, guaranteed. If you find any defects, let us know within 60 days and we’ll take care of it. Check out our Warranty Policy for more details.
Shipping Policy
We ship fast so you can get on the road that much faster. Check out our Shipping Policy for more details.
Easy Return Policy
We’re only happy if you’re happy. If you’re not entirely satisfied with your order, you may be entitled to a refund. Check out our Return Policy for more details.

Customer Reviews

It even comes with a step by step instruction for you specific car. Very nice! I've gotten 12-15% increase in my MPG so far.
Purchased on Oct 02, 2008
This filter is light and it is the last filter you will have to buy. Remeber to read on how to clean it. Rool up your sleves, take out the old one, and instert the new one. 5 minutes work and your car will be happy again.
Purchased on Dec 26, 2007
i use K&N air filters in all my vehicles; and i have for years. two cars and a motorcycle at this time. the improved gas mileage and performacnce is very noticible. i recommend this product to everyone.
Purchased on Mar 04, 2008