

K&N Engine Air Filter: High Performance, Premium, Washable, Industrial Replacement Filter, Heavy Duty: E-3988
Key item features
K&N Engine Air Filter: High Performance, Premium, Washable, Industrial Replacement Filter, Heavy Duty: E-3988
- Engineered Power: State-of-the-art filtration media provides up to 50% more airflow than disposable paper filters to increase power and acceleration. Clogged or dirty air filters can reduce your vehicle’s acceleration by up to 10%.
- Easy Installation: Pre-oiled and ready to drop into your factory air box. One of the easiest and most cost-effective upgrades for your vehicle for quick performance gains.
- Saves Money: K&N high-flow replacement air filters will save you $250 over 10 years by avoiding disposable filters.
- Eco-Friendly: Using a washable, reusable product helps reduce replacement waste. A K&N filter will last longer than 10 disposable filters.
- World Class Protection: Pushing the limits of engine protection by protecting your engine from harmful contaminants.
- Low-Maintenance Design: 50,000 miles before your first cleaning under normal highway driving conditions.
- High Quality
- Race Tested: The Official Air Filter of NASCAR. Trusted on the racetrack—made for your vehicle.
Specs
- Manufacturer part numberE-3988
- Vehicle makeHarley-Davidson
- BrandK&N
- Engine air filter typePaper
- Vehicle fitment typeUniversal
- FeaturesWashable
- Free shipping
Free 90-day returns
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About this item
Product details
K&N Engine Air Filter: High Performance, Premium, Washable, Industrial Replacement Filter, Heavy Duty: E-3988
- Engineered Power: State-of-the-art filtration media provides up to 50% more airflow than disposable paper filters to increase power and acceleration. Clogged or dirty air filters can reduce your vehicle’s acceleration by up to 10%.
- Easy Installation: Pre-oiled and ready to drop into your factory air box. One of the easiest and most cost-effective upgrades for your vehicle for quick performance gains.
- Saves Money: K&N high-flow replacement air filters will save you $250 over 10 years by avoiding disposable filters.
- Eco-Friendly: Using a washable, reusable product helps reduce replacement waste. A K&N filter will last longer than 10 disposable filters.
- World Class Protection: Pushing the limits of engine protection by protecting your engine from harmful contaminants.
- Low-Maintenance Design: 50,000 miles before your first cleaning under normal highway driving conditions.
- High Quality
- Race Tested: The Official Air Filter of NASCAR. Trusted on the racetrack—made for your vehicle.
Specifications
Manufacturer part number
Vehicle make
Brand
Engine air filter type
Directions
Fabric Care Instructions
Warranty
Warranty information
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Customer ratings & reviews
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Showing 1-2 of 2 reviews
Harley Davidson M8
This filter can be trim to fit factory ventilator intake for Harley Davidson M8 to give 50% more filer area.
it's a K&N so it shouldn't be bad.
NOW, 3 weeks after I bought an E-3988 air filter, there is a review on K&N's web site. (the company that owns the big box motorcycle parts stores has reviews) but I digress. My review is, the E-3988 filter IS NOT a direct replacement for the H.D. stock filter on a 2023 Road Glide Special (and other H.D.'s) Yes to make it fit the stock air box trimming AND 2 holes need drilled, and the holes in it need plugged (good duct tape should work).
