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E-2021
$54.99 USD
MSRP $85.89 36.0% Off
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K&N E-2021 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   7 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 E-2021 Air Filter fits some BMW 116i, BMW 118i, BMW 120i, BMW 316i, BMW 318i, BMW 320i, BMW 320si, and BMW X1 18i 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

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

K&N E-2021 Air Filter Product Reviews

Monday, April 23, 2018 - Part E-2021
After reading reviews, I decided to go for this filter instead of the stock one....immediately I noticed better gas response, better fuel mileage (have driven about 300 km since installing) and an overall much more enjoyable experience. As this was the first time I changed the air filter (installation is easy, even for someone with 2 left hands like me - took me about 20 mins) I cannot compare with a brand new stock filter, but considering the difference in materials and technology, my experience would still stand.

Kris De Brouwer
Belgium
Tuesday, August 1, 2017 - Part E-2021
The filter was very easy to fit, and I'm getting more MPG and better response from BMW 1 series 120i E82 coupe. Regards Kevin Mac

Kevin Mac
Croydon, United Kingdom
Tuesday, July 18, 2017 - Part E-2021
I think that the hole of installation is bigger and one has to tighten the metal collar enough. Maybe a bit smaller to fit exactly would be the best solution. Very good performance of the filter.

Ioannis Lyrakos
Pallini, Greece