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E-0644
$97.99 USD
MSRP $178.09 45.0% Off
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K&N E-0644 Air Filter

Replacement Filters > Replacement Air Filter
Rating Star 1 Rating Star 2 Rating Star 3 Rating Star 4 Rating Star 5   4.9 out of 5 stars   16 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-0644 Air Filter fits some Ford F250 Super Duty, Ford F350 Super Duty, Ford F450 Super Duty, and Ford F550 Super Duty 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 ShapeOval
Filter MaterialCotton Gauze
Height8.938 in (227 mm)
Inner WireNo
Outside Length9.25 in (235 mm)
Outside Width6.5 in (165 mm)
Top StyleRubber
Top MaterialNone
Flange Length0.281 in (7 mm)
Flanges1
Package Contents1 Air Filter
Package Quantity1
Product StyleOval Air Filter
Weight4 lb (1.8 kg)
Filter Re-Oiling Amount8.3 oz (246 ml)
Product Box Height12.06 in (306 mm)
Product Box Length12 in (305 mm)
Product Box Width8 in (203 mm)

K&N E-0644 Air Filter Product Reviews

Monday, May 28, 2018 - Part E-0644
I always immediately swap the OEM air filters on my cars with K&N drop-in air filters and I love the reusability vs. OEM. This makes them a tremendous value over time, with enhanced performance to boot. My only complaint with this particular filter is that it did not come with the foam element required to fit the factory air box, nor did it come with literature addressing the need to remove the element from the old filter and reuse it with the new K&N filter. Due to the rectangular cutout on side of the filter box, it is not optional to run your engine without the foam element as this would cause excessive dust buildup and negate the air pressure modulation within the air intake. I nearly returned it for a refund until I read the reviews and saw how others dealt with this issue. I highly recommend that, in the future, K&N include some kind of written instructions regarding this for this particular filter. Otherwise, these filters are a great product.

Stephen Clark
Riverside, California
Wednesday, May 16, 2018 - Part E-0644
I am extremely happy with this filter it raised my MPG 1 mile per gallon. I drive a 2018 F250 6.2 L.

Bruce Altman
Warrens, Wisconsin
Monday, May 7, 2018 - Part E-0644
Arrived quickly. Fit perfectly. There was one extra foam strip on my OEM filter that was not on the K&N replacement. I removed and reused the OEM foam piece.

Jonathan Miller
Modesto, California