Donaldson Blue® 6637 Intake Filter for Ford 7.3L 94-03
Donaldson Blue® air filters with Ultra-Web® nanofiber technology protect engines by providing better initial and overall efficiency compared to conventional cellulose media. Donaldson invented air filters for heavy-duty diesel engines over 100 years ago and were the first to develop nanofiber air filter media for the diesel engines, with more than 20 years of proven performance.
- Longer Engine Life - Donaldson Blue™ air filters provided better engine protection by allowing much less contaminant to pass through than cellulose air filters but still maintaing a higher flow rate
- Longer Filter Life - Smaller interfiber spaces of Ultra-Web® nanofiber technology hold more submicron contaminant than conventional filters with cellulose media, delivering longer filter life
- Increased Flow - Utilizing the nanofiber Ultra-Web® media has allowed for a 37% increase in flow over the standard 6637 cellulose filter. It has also been tested to flow over 1300 CFM+.
- Ultra-Web® Nanofiber Technology -- Exclusively in Donaldson Blue air filters
- Engineered to perform in extreme temperature and humidity conditions, unlike ordinary nanofibers and cellulose which aren't hydrophobic
- Proven in the real world – used in diesel engines for nearly two decades
- On-road applications are guaranteed to go twice the distance compared to standard cellulose filters
We suggest buying them in quantities of 2 as your shipping won't increase much and you will save money.
100% Made In The USA
NOTE: This filter is disposable and is NOT washable.
138 Reviews Hide Reviews Show Reviews
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Great FIlter
Bought this to replace one of the larger Dondaldson BHAFs in my Dodge for better hood clearance. Very pleased with this compared to the paper element filter it replaced. Hoping the synthetic media will last longer than the paper since I was replacing the filters due to age degradation rather than flow restriction (truck is driven ~5k miles per year).
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Excellent Product
Excellent Price
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New Air Filter
Great quality filter. My truck loves it.
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Air filter
Just what I wanted
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Donaldson Blue
Great Filter! Great Price! Riffraff is the Best
for OBO Powerstroke products! -
Donaldson blue filter Wow
This filter made a huge difference in performance compared to KN filter, plus the cover adds another layer of motor security. Highly recommend this product, You will not no disappointed.
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Awesome filter
This is a awesome filter love it
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Great product
Gave my Excursion the extra power I needed, better flow, sound, and maintaining speed when hauling I needed!!!
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Excellent air filter
Replaced my K&N filter with the Donaldson filter due to many comments about engine performance improvement. Hard acceleration while passing was a dramatic difference. It felt effortless and smooth. Not bad for a 2000 7.3L dually! I’m sold!