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K&N Round Replacement Air Filter E-1946

Product Information
Our Price: $86.39
Part #:E-1946
Filter Application:Round Style Filter
Applications: View All
  • Easy to install
  • Filter is washable and reusable
  • Backed by a million mile limited warranty
Download Installation Instructions
Add to Cart
Ships Oct 26th - 27th


  • Creates a high air flow with excellent filtration
  • Designed to increase horsepower and acceleration
  • Designed to be washable and reusable
  • Direct replacement of factory air filter
  • Will NOT void vehicle warranty
  • Lasts up to 50,000 miles before cleaning is required depending on driving conditions
  • Backed by K&N Million Mile limited warranty
  • Emissions legal in all 50 US States
  • K&N air filter will last the life of your truck, car, or SUV
  • Works with original equipment manufacturer vehicle electronics
  • Easy high performance add-on
  • Environmentally friendly


K&N direct fit stock replacement air filters - these are the original high-flow air filters. Since 1969 K&N Engineering has been designing, manufacturing, and enhancing high-flow air filters truck, car, SUV, and motorcycle enthusiast interested in maximizing horsepower, acceleration, and fuel-efficiency.

K&N not only has more applications than any other manufacturer of similar product, these guys invented the high-flow category and high-flow technology. How good is K&N? Well, they're the only air filter used at the Indianapolis 500®. The K&N FilterCharger® air filter is designed to achieve high, virtually unrestricted air flow while maintaining filtration levels critical to ensure long engine life. A K&N filter directly replaces the factory filter, making for a quick and easy install.

K&N air filters are constructed using 4 to 6 layers of cotton gauze, which is between two epoxy-coated aluminum wire screens. The cotton is treated with a formulated oil, which is designed to capture dust particles, allowing for a cleaner air to pass through to the engine. K&N filters can last up to 50,000 miles before needing to be cleaned – depending on driving conditions. Once cleaned, they go right back to work under the hood. This filter is going to last longer than the vehicle it's installed in, and K&N backs that statement with a million mile limited warranty.

If you don't have a K&N direct fit stock replacement air filter in your vehicle, you're basically lighting money on fire and robbing your vehicle of power and efficiency. Not sure about you, but that's not something I'm interested in doing. Get you K&N air filter today, and reap the benefits…for a long time!

Order Notes

Use the K & N Cross Reference Guide if You Know a Manufacturer's Part Number!

View Available Part Numbers For This Product Line


  • (1994) Ford F250 7.3L V8 Powerstroke, VIN F, 7.3L V8 Powerstroke
  • 1995-1996 Ford F250 7.3L V8 Powerstroke, 7.3L V8 Powerstroke
  • (1997) Ford F250 Super Duty, 7.3L V8 Powerstroke, 7.3L V8 Powerstroke
  • (1994) Ford F350 7.3L V8 Powerstroke, VIN F, 7.3L V8 Powerstroke
  • 1995-1997 Ford F350 7.3L V8 Powerstroke, 7.3L V8 Powerstroke


Engine Protection, Filtration. Anyone can flow more air.  The trick is to flow more air safely.  In our opinion we hit the sweet spot – an optimal blend of high air flow, filtration efficiency, durability and dust capacity.  We take filtration seriously.  K&N Air Filter media has been tested both in-house and by independent labs using the ISO5011 test developed by the Society of Automotive Engineers.  In addition we test many of our filters both in and out of the OE air box ensuring proper fit and function.  Our goal is to design filters with the maximum possible airflow achievable while providing guaranteed engine protection.

The Importance of Oil
A K&N Air Filter is made of 4 to 6 layers of cotton gauze sandwiched between two epoxy-coated aluminum wire screens.  The cotton is treated with a specially formulated grade of oil causing tackiness throughout the cotton’s microscopic strands.  The nature of the cotton allows high volumes of airflow, and when combined with the tackiness of the oil creates a powerful filtering media that ensures engine protection.  In contrast, most other media cannot maintain the same balance of airflow and filtration throughout the filter's life without sacrificing one or the other.  With a K&N Air Filter, there is no sacrifice.

Testing – Laboratory and Real World
K&N uses independent laboratories to help ensure that our products meet or exceed your high performance and high filtration demands.  Better yet, we conduct our own testing at our own state-of-the-art in-house testing laboratory.  For more information on K&N air filters and testing go to the K&N Technical Learning Center area.  K&N’s dedication to providing a first-class air filter can also be seen outside the testing laboratory. Consider that K&N has sold more than 20 million air filters since 1969. One such filter was put in the air box of a three-quarter ton Chevy pickup and driven more than one million miles by Carl Judice of New Iberia, Louisiana. Carl points out that he has never rebuilt the engine, nor removed the cylinder head from his trusty pickup truck. Real world testing and customer satisfaction doesn’t get any better than that.

Never Replace Your Air Filter Again
Handmade in the USA and in the United Kingdom using only the finest materials, K&N OE Replacement Air Filters are washable and reusable.  Regardless of what you’ve heard, it’s almost impossible to wash your K&N Air Filter too much.  Inside our testing laboratory, we have washed and re-oiled one K&N Air Filter more than 100 times and it still performs up to specification.  Depending on your driving conditions, we recommend cleaning your air filter every 50,000 miles.  To clean and re-oil, purchase our filter Recharger® service kit and follow the easy instructions.

Fuel Economy
Fuel economy testing and mileage claims are a tricky business. Just ask the EPA, whose website states, “EPA’s fuel economy estimates are designed to allow consumers to comparison shop.  Your fuel economy will almost certainly vary from EPA’s fuel economy rating.  This is based on a number of factors, such as weather, road conditions, you’re driving and maintenance habits, and your use of air conditioning.”  Under Gas Mileage Tips they go on to say, “Replacing a clogged air filter can significantly improve your car’s mileage”.  A lot of exaggerated claims are made in the marketplace by products claiming to improve gas mileage.  K&N makes no general fuel economy claims, however we encourage you to try our air filter for yourself.  Keeping air filter restriction as low as possible can be an important tool, among others, for maintaining high mileage.

K&N Million Mile Limited Warranty® and Consumer Protection Pledge
K&N warrants its street vehicle OE Replacement Air Filters for one million miles. When used properly and found to be defective, return your filter and the receipt from purchase and K&N will replace it free of charge. K&N’s Consumer Protection Plan goes one step further than its Million Mile Warranty. The performance aftermarket has, at times, been plagued by car manufacturers and automotive dealers that may attempt to discourage you from customizing your vehicle. They prefer you buy OE parts and not modify your car or truck and have even been known to void their own manufacturer’s warranty due to vehicle modification. That sounds un-American to us, which is why K&N and the Magnuson-Moss Warranty Act (more information here) protect consumers from such denied warranty claims.  When you buy an OE replacement K&N High-Flow Air Filter or High-Flow Air Intake System you can be confident your vehicle’s warranty will remain in effect.  If you experience a difficult dealership, K&N will resolve the issue so you won’t have to. The following summarizes the K&N Consumer Protection Pledge:
K&N pledges to our customers that they will not be taken advantage of and charged for a repair due to a dealership warranty denial blamed on the presence of a K&N product.

How It Works

K & N engineering air fliters and filtration A Word about Air Flow
What's the big deal about air flow? Simply put everything! At its most basic level, an engine is an air pump. More air entering the engine increases the efficiency of the combustion process creating more horsepower and torque. Horsepower is a measure of the engine's maximum power while torque measures how quickly you can accelerate. The K&N FilterCharger® is designed to increase engine performance in both horsepower and throttle response by reducing air flow restriction.


K&N direct fit stock replacement air filters are a direct replacement of the factory air filter. K&N air filters can be installed in a matter of minutes, and those precious minutes will pay off indefinitely. If you have any questions, give us a call at 877-216-5446.

PDF Icon K&N E-1946 Installation Instructions

1 Million Mile Limited Warranty

All K&N OE replacement Air Filters - as specified below - are warranted against defective materials or workmanship for one million miles. 
Any K&N air filter listed in our catalog or on our web site as an OE replacement air filter with a cross reference to a specific vehicle or motorcycle; except for those air filters sold for use on ATV’s and motorcycles designed for dual purpose and/or off-road use. 
Our warranty covers the original purchaser of a K&N Air Filter who has provided proper proof of the original retail purchase.
Any K&N Air Filter used for 1- any type of racing or competition; 2 - any off-road use, custom or modified applications; 3 - any illegal highway use, marine, or industrial applications. (These units are covered by a one year unlimited mileage warranty.) 
Incorrect Service: The K&N Air Filter must be cleaned and serviced with K&N cleaner and air filter oil (or comparable cleaner and oil) per the prescribed routine maintenance procedure as outlined in the product literature that accompanies the K&N Air Filter. Use of any cleaner or oil that damages the filter or compromises its performance (gasoline, transmission fluid, motor oil, lightweight oil, or diesel fuel) will void the warranty.
No Proof of Purchase: At time of warranty claim, buyer must provide proof of purchase (original receipt or invoice). 
Incorrect Use: Any damaged, abused or modified K&N Air Filter will not be warranted. 
Any defective K&N Air Filter properly returned to K&N will be replaced. K&N will not be responsible for any other expenses incurred by the customer under the terms of this warranty, nor shall it be responsible for any damages consequential, special, contingent, or otherwise; or expenses or injury arising directly or indirectly from the use of the K&N Air Filter. Any K&N Air Filter returned to K&N must be sent at customers' expense along with proof of purchase. K&N reserves the right to determine whether the terms of the warranty, set out above, have been properly complied with. In the event that the terms are not complied with, K&N shall be under no obligation to honor this warranty.