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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Donaldson blue
Just what I needed and expected.... Quality and it can breathe now
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Great Filter
Perfect fit. Well made. Water proof. What more could you want?
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Best filter I've used
Huge improvement over the OEM air box! Pulls much harder and sounds great! I'll never use a paper element filter again.
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Filter
Doesn't seem to really be any different than any other filter but it keeps the air clean and my turbo happy so I'm good!
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Great filter
Great filter! RiffRaff is great as well!
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Good price, fast delivery
I usually run the std Donaldson but decided to give this a try. My truck sees allot of dirt roads during hunting season, and the extra protection is worth the small price increase since i change the filter once a year or 10000 miles. I did notice 2 mpg improvement!
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Nice filter
I have always had good luck with RiffRaff. Products arrive on time and the quality is excellent.
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Replaced K & N filter & used cold air intake tube.
I was hesitant to purchase the filter because I wasn’t sure it would work with my existing K&N cold air intake system on my 01 7.3L F-250. It worked with the intake tube, I had to remove the fire wall though ...simply zip tied the sensor out of the way.
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Great product
Definitely feels like it increased my acceleration and improved fuel mileage.