K&N E-2021

Replacement Filters > Replacement Air Filter
List Price: $76.89
Your Price: USD $48.99

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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 ShapeRound
Filter MaterialCotton Gauze
Filter Re-Oiling Amount0.79 oz (23 ml)
Height4.5 in (114 mm)
Inner WireNo
Inside Diameter3.156 in (80 mm)
Outside Diameter5.125 in (130 mm)
Package Contents1 Air Filter
Package Quantity1
Product Box Height7.13 in (181 mm)
Product Box Length7.06 in (179 mm)
Product Box Width7.06 in (179 mm)
Product StyleRound Air Filter
Top Material/FinishNone
Top StyleRubber
Weight1 lb (0.5 kg)

Customer Feedback

Be the first to review part E-2021
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

I recently acquired a brand new BMW 120i cabriolet. Since I live in a city at 2700 foot altitude, the car losses horse power and it becomes almost unpleasant to drive in such conditions. I begun searching with my friends and I thought to remap the ECU, but you all know it could be a little bit risky because you can void your guarantee as well as the RON of our gas is not enough to support new map. Then I decided to go for an intake and filter from K&N. I have to confess I was skeptical about what I saw on the internet, where you can find good and bad experiences. At the end, I took my chances and replaced the air box for the K&N intake system. The result... I was amazed about the sound. The engine's sound seems to be more powerful, but the deal was closed once I get into my car and drove it. The lag of the acceleration almost disappeared and for sure I could feel more power and torque. The feeling of driving such a car is now different and totally pleasant in terms of power, sound and acceleration. Thanks K&N... You gave me back the good feeling of having a BMW.

Fabio Alzate
BMW 320i e36 with K&N stock replacement air filter
Perfect sound, instant reaction.

David Novotný
Czech Republic