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
-
WOW!
What a difference. I took of my Napa wix and but then on and I can feel and hear the difference. Plus less smoke! Home run.
-
Another Excellent Product
Excellent long-standing brand product sold by an excellent business!
Thanks Riffraff! -
Best filter for the buck
I always buy the blue Donaldson filter it’s resistant to water which makes cleaning the engine bay a breeze it goes with my truck, and really they keep dirt out very well I usually buy one every 15k miles
-
More turbo whistle
My 7.3 sounds happy now.
-
Best Filter For Your 7.3
I previously bought an $$ S&B filter kit with the big intake box. The replacement filters were expensive and the big box really made accessing the powersteering reservoir a real pain. Pulled that out and replaced it w a battery tray and this Donaldson filter. Superior filter at a better price and now lots of room under the hood without that plastic intake box. Riff Raff is the place to buy from a great prices and fast shipping and excellent customer service.
-
Blue 6637
Nice filter for the price.
-
Best 6637 filter diy intake
I am a fan ... Feel the squeal...no mpg gain but I believe it lasts longer and cleans the air better. I only buy the blue and only riffraff sells it.
-
Great in dusty conditions
The filter last a long time in dusty arizona conditions, and wont pass abrasives like some other oiled filters.
-
Does the job better
Replaced a standard 6637 with this hi flow filter. Looks as good as it performs.