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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product
Looks well made
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DONALDSON BLUE® 6637 FILTER
My truck breathes way better with this filter
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Great filter
Not the cheapest option but certainly the best. I've put nearly 200,000 miles on my truck using these filters and the intake tube is clean and the turbo fins are still sharp.
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Best filter on the market
Flows like a beast. The napa filter has noting on it. The other filters choke out pretty quick. Seen this guy up to low 30s.
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Quality
Good quality filter worth the price of other aftermarket filters. 10 out of 10 would recommend
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Donaldson Blue 6637 Filter
I originally had the Napa 6637 filter on the truck and when getting ready to change the air filter decided to buy the blue 6637 from Clay as it was a better price than even the basic parts house 6637 equivalent, even with shipping across the US.
I have used Donaldson filters for all sorts of equipment and trucks at work for years and know them to be top quality when it comes to dirt/particle filtration, but wasn’t sold on the idea that this filter would have significantly more flow than the regular 6637. I am happy to report that after getting it installed and making a few drives, the “seat of the pants” difference is definitely noticeable. The noise isn’t much different than the regular 6637 as they are both open element systems, but the power has increased, especially mid range; such as merging onto the highway or passing in the left lane.
The product gets 5 stars. I do wish, however, that I had followed Clay’s advice and ordered two at once to save on shipping costs when I need another. -
King of Filters
This is by far the best filter for your 7.3L for filtration and flow. Changed to these years ago and never looked back.
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One of my favorites
After all of the different work I've done to my truck this is still one of my favorite buys, especially because it's cheap, easy, and a quality part. You can hear the big difference and the turbo loves it too. Pretty simple to install and then very easy to replace after that.
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6637 filter
Works good and hooked right up. Had a clear film on the plastic part though.
