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33-2231
$52.99 USD
MSRP $81.79 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   23 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®
The K&N 33-2231 Air Filter fits some BMW 316Ci, BMW 316i, BMW 318Ci, BMW 318i, BMW 318ti, BMW 320Ci, BMW 320i, BMW 323Ci, BMW 323i, BMW 325Ci, BMW 325i, BMW 325Ti, BMW 325Xi, BMW 328Ci, BMW 328i, BMW 330Ci, BMW 330i, BMW 330Xi, BMW M3, and BMW X3 models. See vehicle applications link for details.
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
WashableYes
Height1.063 in (27 mm)
Outside Length9.375 in (238 mm)
Outside Width6.875 in (175 mm)
Package Contents1 Air Filter
Package Quantity1
Warranty1,000,000 Miles/10 Year
Product StylePanel Air Filter
Weight0.8 lb (0.3 kg)
Filter Re-Oiling Amount1 oz (30 ml)
Product Box Height9.69 in (246 mm)
Product Box Length7.72 in (196 mm)
Product Box Width1.75 in (44 mm)
WARNING: Cancer and reproductive harm--www.P65warnings.ca.gov

K&N 33-2231 Air Filter Product Reviews

Thursday, April 26, 2018 - Part 33-2231
Great product and service, thank you, K&N.

Neil Bynoth
Colchester Essex
Thursday, December 21, 2017 - Part 33-2231
I am very pleased with the filter and the accompanying fitting instructions with photographs are very useful and accurate.

Phil Carter
Keyingham, Near Hull, United Kingdom
Tuesday, August 1, 2017 - Part 33-2231
No comment. The best as always!

Ihsan Annan
Dubai, United Arab Emirates