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33-3051
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K&N 33-3051 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   5 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 33-3051 Air Filter fits some BMW 120i, BMW 125i, BMW 220i, BMW 230i, BMW 230i xDrive, BMW 320i, BMW 320i GT, BMW 330e, BMW 330i, BMW 330i GT, BMW 330i GT xDrive, BMW 330i xDrive, BMW 340i, BMW 340i GT, BMW 340i GT xDrive, BMW 340i xDrive, BMW 420i, BMW 430i, BMW 430i Gran Coupe, BMW 430i xDrive, BMW 430i xDrive Gran Coupe, BMW 440i, BMW 440i Gran Coupe, BMW 440i xDrive, BMW 440i xDrive Gran Coupe, BMW M140i, BMW M240i, and BMW M240i xDrive 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 ShapeTrapezoidal
Filter MaterialCotton Gauze
Height1.25 in (32 mm)
Outside Length10.5 in (267 mm)
Outside Width10.25 in (260 mm)
Package Contents1 Air Filter
Package Quantity1
Warranty1,000,000 Miles/10 Year
Product StylePanel Air Filter
Weight1.2 lb (0.6 kg)
Filter Re-Oiling Amount1.47 oz (44 ml)
Product Box Height11.56 in (294 mm)
Product Box Length10.44 in (265 mm)
Product Box Width1.75 in (44 mm)

K&N 33-3051 Air Filter Product Reviews

Saturday, June 23, 2018 - Part 33-3051
Hi, I am extremely happy with this filter that I bought for my BMW 340i (with MPPK). To all the sceptics out there, I've attached my dyno graph which shows significant gains in both power and torque (conservatively around 10wkw and 18NM respectively).

Sugandrian Naidoo
Fourways, South Africa
Thursday, December 21, 2017 - Part 33-3051
Have used K&N air filters with a number of my cars over the years. Have certainly noticed an increased response during acceleration and an improvement in MPG. Excellent durability and performance. Definitely recommended.

Jim A.
West Midlands, United Kingdom
Tuesday, October 3, 2017 - Part 33-3051
Super product, you can feel direct the difference between normal and K&N filter.

Alexander Bruijs
Kapellen, Belgium