K&N Engine Air Filter: High Performance, Premium, Washable, Industrial Replacement Filter, Heavy Duty: E-3988
K&N Engine Air Filter: High Performance, Premium, Washable, Industrial Replacement Filter, Heavy Duty: E-3988
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K&N Engine Air Filter: High Performance, Premium, Washable, Industrial Replacement Filter, Heavy Duty: E-3988

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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.
Current price is $68.99
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  • Free 90-day returns

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4.5 out of 5 stars
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Showing 1-2 of 2 reviews

May 18, 2022
BenjamenB
5 out of 5 stars review

Harley Davidson M8

This filter can be trim to fit factory ventilator intake for Harley Davidson M8 to give 50% more filer area.

Review from K and N Filters
Helpful?1QCISCHAWPBX930109686
Jun 15, 2024
'23 Road Glide owner
4 out of 5 stars review

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).

Review from K and N Filters
Helpful?1QCISCHAWPBX930109686