K&N E-2850

Replacement Filters > Replacement Air Filter
List Price: $76.50
Your Price: USD $51.99

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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 Amount0.84 oz (25 ml)
Height1.875 in (48 mm)
Inner WireNo
Inside Diameter9.5 in (241 mm)
Outside Diameter11.25 in (286 mm)
Package Contents1 Air Filter
Package Quantity1
Product Box Height3.63 in (92 mm)
Product Box Length12.25 in (311 mm)
Product Box Width12.25 in (311 mm)
Product StyleRound Air Filter
Top Material/FinishNone
Top StyleOpen
Weight1.5 lb (0.7 kg)

Customer Feedback

Why don't BMW fit your filters as Standard?

To K&N Staff,
     I have just purchased 1 of your filters today, for my BMW 320 (2.2) 2001 which I have owned since new and it has never been that smooth with it's power delivery.  In the last 5 miles since I have installed your filter I have seen my car come to life, there is no pinking , no judder or delay, it is a shame that companies like BMW do not put quality performance equipment in their cars like your filters.

Well done K&N keep up the good work.


London, United Kingdom
Before using the K&N Air Filter on my BMW 2002 325Ci I was consistently getting 400 miles a fill-up. Since the installation I am averaging 425. Once I got 445. Plus I got a few extra ponies from the throttle.

Dat Nguyen
La Puente, California
Installed a Typhoon kit in my 98 Honda Civic EX November, 2002. The increased performance was noticeable immediately, the engine starts/rev's quickly. Had to wait 5 months for warm weather to judge changes in mpg (and cut back on some of the playing!). It looks like a 3 mpg (34 cold/39 warm weather) improvement in normal driving. Installed K&N air filters in the other Civic (my daughter says her DX starts better and is quicker than a friend's EX) and the CRV (K&N installed at 300 miles so performance/mpg is all K&N).

Gave an air filter to my Dad for his Buick. Most of his driving is around town stop and go. He did note the car computer normally calculates about 30 mpg on the highway, but since the K&N installation the trip computer calculates 38-40 mpg.

Drove with a friend in a BMW 330 last month on a 750 mile one-way trip and noted 23.7 mpg. Changed to a K&N while we there averaging 26 mpg that week and 28.1 mpg on the return drive. The Beemer is loaded with power and it is hard to say if performance improved. But buying hi-octane gas less often says a great deal!

Jim Reaves
Indianapolis, Indiana