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.
137 Reviews Hide Reviews Show Reviews
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Wow!
What an improvement. I have run the 6637 from Napa for almost 10 years now. Decided to give this Blue a try and what a massive difference. I can now clean up all my fuel, no smoke, and more power. Wish I had seen these years ago! I am sold, don't waste your time on other filters, get the Donaldson and don't look back.
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Upgrades
Decided to go blue when I replaced my old 6637 and haven’t been disappointed yet. Furthermore if there is any thing you need this is the place to get it. Riff Raff is my #1 go to when I need something for my 02 7.3l. Having a hard time finding good place to deal with look no further Riff Raff is the place come to.
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Ease of installation
I replaced the old filter and the new Blue one went right on easily and it performs better than expected.
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Donaldson blue 6637 filter
I can’t believe you could have made it better, but you did. It’s only the Donaldson blue for my truck.
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Awesome Filter
Best filter around in my opinion especially with the filter cover I run it on all my trucks
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6637 filter
Good improvement over factory
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Air Filter
Works very well, definitely opens the truck up a bit and gives you some more low end power. Would recommend if you have an early 99 7.3 to just buy the whole filter kit, nobody seems to have or be able to get the 4in pipe bent at a 45 degree angle to fit the truck.
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Good value
Lasts quite a while
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this filter sounds like it flows well,
best price i could find