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.
141 Reviews Hide Reviews Show Reviews
-
Great Improvement
After years of running a standard 6637 I saw this and decided to try it. What a difference! Way more flow, less smoke and better mileage.
-
6637 Filter on Titan XD V8 5.0L Cummins
I have a 2016 Nissan Titan XD Diesel with a 5.0L Cummins. I ran a S&B cold air intake for the last 6 years. The 6637 filter puts them to shame. I had to do a lot of modifications to make this filter work on my truck, but it fixed a lot of my issues. I have more power, I get a ton of air flow now. Truck performance is up. My MPG went up 3mpg in the city. It also took away a lot of the lag that you experience with the Titan XD Dieael. I can actually hear my turbo now when I'm going down the road. Overall the best filter I have ever purchased. I will continue to use this filter from here on out. I was blown away is an understatement. Also want to give a shout out to Riffraff Diesel. They were prompt on getting my order to me quickly. They also provided updated text on shipping details every step of the way. Great customer service! The free sticker was also a plus! Overall very pleased!
-
Good shit
Works good. Good shit
-
Donaldson Blue 6637
Major improvement over the standard 6637. Much better air flow, I can definitely tell the difference in better throtte response. I even picked up an extra mile per gallon
-
product
Looks well made
-
DONALDSON BLUE® 6637 FILTER
My truck breathes way better with this filter
-
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.
-
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.
-
Quality
Good quality filter worth the price of other aftermarket filters. 10 out of 10 would recommend
