K&N E-9289 Air Filter

Universal Air Filters / Replacement Air Filter
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$78.99 USD
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Product Overview

  • Replacement air filter for 57S-4000
  • Designed to boost horsepower and rate of acceleration
  • Can be cleaned and used over and over again
  • Comes with a K&N embossed lid cap
The K&N E-9289 Air Filter is designed to increase horsepower and protect your engine by reducing restriction and providing excellent filtration. The E-9289 custom air filter is manufactured to replace the air filter in the 57S-4000 performance air box and it comes with a K&N embossed lid cap. The filter media can be washed and reused repeatedly.

[More Information on K&N Universal Air Filters with Custom Caps]
Air Filter ShapeRound Reverse Tapered
Filter MaterialCotton Gauze
Flange Inside Diameter2.75 in (70 mm)
Flange Length0.438 in (11 mm)
Flange TypeCentered
Height7.688 in (195 mm)
Base Outside Diameter5.75 in (146 mm)
Top Outside Diameter5.938 in (151 mm)
Top StylePlastic
Top MaterialNone
Package Contents1 Air Filter
Package Quantity1
Warranty1 Year Limited
Product StyleRound Tapered Universal Air Filter
Weight1.2 lb (0.5 kg)
Filter Re-Oiling Amount1.04 oz (31 ml)
Air Filter Large End Diameter5.719 in (145 mm)
Product Box Height11 in (279 mm)
Product Box Length6.38 in (162 mm)
Product Box Width6.38 in (162 mm)
WARNING: Cancer and reproductive

K&N E-9289 Air Filter Product Reviews

Thursday, October 25, 2018 - Part E-9289
I have had K&N years ago and it was good... this item improved the performance of my ST diesel. But wasn't quite what I was looking for, so I bought a superchips blufin remap, car is better with standard filter and remap, I assume because remap doesn't allow for extra air intake. If you want a quite cheap improvement this is great,, if you want a serious power improvement get a remap.. but don't buy both.. also as others mentioned, you can buy this filter for £ fits in standard air box, don't pay £200 for the item that comes in new housing unless you want to pay extra £110 just to have K&N moulded on the plastic.. superb filter though..

Hampsire, United Kingdom
Wednesday, March 28, 2018 - Part E-9289
Great replacement. Immediate boost in acceleration and less fuel consumption Installed it on my Ford Focus 2011 Sedan.

Aalter, Belgium
Tuesday, January 30, 2018 - Part E-9289
Bought to replace the standard filter in the standard air box in my Focus ST MK3. I didn't want to pay the extra £100 for the air box lid lid which is the only addition you get with the 57S-4000 induction kit. This fits fine with the original lid, and it's a little sneaky of K&N not to make that more obvious The standard filter replacement doesn't have the open end like this one so this a more significant upgrade. It is the ultimate cheap upgrade Car revs better and sounds better, and the throttle response is more even. Would love to know the real reason why Ford does't fit these as standard (there must be something more than just cost...). So glad I bought it though. Love it.

Si Coote
Renfrewshire, Scotland