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
I read the reviews about the regular 6637 with a large following, but knew the math doesn't add up for better breathing than stock filter. They report noisier turbo, but that is from starvation. This filter is quite like stock, but breaths so much better while stock or with upgrades. I'm very pleased with the product. Thanks riffraff for the great solution.
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Increased Flow
This filter looks and feels like a very high quality product. I replaced my K&N filter kit with this Donaldson Blue filter. I believe it breathes a lot better then either the stock filter or a K&N kit. I had to cut my battery tray on the driver side to fit this filter though. I recommend this product if you are looking for increased flow and protection.
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The new blue Donaldson filter looks sounds and a great product
I pick up a few mpgs on towing and all around driving in my 2003 f250 7.3 , the filter looks great under the hood and sounds great driving I'm very happy with my purchase !!
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WOW
ordered this filter last week to replace my old k&n filter that seemed to rob my truck from power. Installed this filter today and went for a drive noticed a serious power difference along with a slight egt decrease and no longer blowels black smoke. Great job riff raff will definately be buying again and will come to you for my future mods
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great filter
I like this filter over the std filter.I feel their is better pick up off throttle.
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Best air fliter out there.
I have run the original 6637 donaldson filter in my 95 cclb drw and it was a good filter, but this new blue filter is great! I gained 1/2 mile to the gallon between the two filters with the ts chip on the 50 hp setting. I currently am getting 17 mpg with just an intake and a ts chip.
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Donaldson 'Blue'
This filter is one of the best I've seen. Fits in the vacated original filter box location very well.
Helps my Power Stroke breathe as it should. -
Donaldson Blue
Great filter. Turbo spools faster and lower egt's up long hills. Fits nice under the hood with factory air box removed.
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1999 F250 Super Duty 7.3 liter
Just fits behind the battery area. Installed a Filterwears pre-filter over it. Fits on the existing K/N intake tube. Had to remove what was left of the stock air box to fit it. Seems a little peppier to me, like it's getting more air flow. It's much larger than the K/N filter. Happy with it so far. Pre-filter is a nice bright yellow, looks good.
