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K&N 33-2125 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   16 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 33-2125 Air Filter fits some Audi A4, Audi A4 Quattro, Audi A6, Audi A6 Quattro, Audi Allroad I, Audi Allroad Quattro, Audi RS4, Audi S4, Audi S6, Skoda Superb, and Volkswagen Passat 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
Height0.75 in (19 mm)
Outside Length9.875 in (251 mm)
Outside Width8.25 in (210 mm)
Package Contents1 Air Filter
Package Quantity1
Product StylePanel Air Filter
Top StyleOpen
Weight1.1 lb (0.5 kg)
Filter Re-Oiling Amount1.32 oz (39 ml)
Product Box Height11.56 in (294 mm)
Product Box Length10.44 in (265 mm)
Product Box Width1.75 in (44 mm)
Inner WireNo

K&N 33-2125 Air Filter Product Reviews

Monday, August 28, 2017 - Part 33-2125
Fantastic product, great price and does exactly what it's supposed to. That simple.

Thomas Pluister
Charlevoix, Michigan
Sunday, June 11, 2017 - Part 33-2125
A good product and a fast delivery. Thanks.

Tuomo Jari Kantola
Kemijarvi, Finland
Tuesday, January 24, 2017 - Part 33-2125
I drive my 2005 VW Passat 1.8 all over the Midwest for work. My average highway mpg increased well over 10. Before, I was lucky to average 27 mpg at 70 mph. After replacing old paper filter with the K&N, I've easily reached an average of 30 mpg, even in cold weather. Very impressed.

Josh Hughes
Grand Rapids, Michigan
Wednesday, November 2, 2016 - Part 33-2125
Air filter arrived quickly, and is a great quality product. Very impressed with the service from K&N.

Philip Pearson
Bangor, Northern Ireland
Friday, October 28, 2016 - Part 33-2125
I can already feel the difference in acceleration.

Kellom Williams
New Orleans, Louisiana
Monday, October 24, 2016 - Part 33-2125
Perfect replacement filter for Audi A6 2.7 twin-turbo. The engine reacts faster and gets to full power quicker. I highly recommend this filter seeing that it does not cost more than the OEM Audi filter. Filter was ordered and received three days later.

Philippe Malagoli
Blainville, Canada
Monday, June 13, 2016 - Part 33-2125
Fantastic! What a difference. I will buy these until I die.

David Dow
Albuquerque, New Mexico