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K&N E-9289 Air Filter

Universal Air 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
  • 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]

Available Information

Product Specifications

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
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)

K&N E-9289 Air Filter Product Reviews

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
Friday, July 28, 2017 - Part E-9289
I bought this product to replace the manufacturers air filter on a 2016 focus st3 and was very helpfully informed by a member of staff that this is the same air filter that mountune use on their upgrades to ford vehicles . Shipping was very fast and efficient couldn't ask for more. The product itself is very good as you would expect, it came pre oiled and installation took less than 5 minutes. Just as a bonus, makes a lovely sound on intake as well .

Weston-super-Mare, United Kingdom
Saturday, March 11, 2017 - Part E-9289
This product does as it says, improves horsepower and accleration response, with some improved gas mileage. I will never have to buy another filter again for the life of my vehicle. They've done the research and earned my trust. The best? It's made in the USA. Keep up the great work and can't wait to see what the future holds.

Tuesday, November 8, 2016 - Part E-9289
This filter really brings to life the intake & turbo sounds of my Focus RS compared to stock filter. Love this purchase.

Chad Donner
Bryan, Texas
Wednesday, November 2, 2016 - Part E-9289
Excellent service - this was out of stock and I was updated continually until it arrived. It fitted perfectly and the car (Ford C max 1.8 TDCI) is far more responsive with a really noticeable power increase. Will buy K&N filters for all my cars now.

Pete Bullivant-Clark
Banbury, United Kingdom
Monday, May 4, 2015 - Part E-9289
I drive a Ford Focus RS mk2. This is THE best filter ever. Thank you K&N.

Michel Mans
Saturday, April 12, 2014 - Part E-9289
Excellent service from K&N and excellent fit in my 2014 Ford 2.0L Escape. I run without the cap and have seen a consistent 0.5 MPG improvement along with better throttle response.

Don Perretti
San Diego, California