K&N E-3720

Replacement Filters > Custom Air Filter
List Price: $84.32
Your Price: USD $53.99

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K&N's replacement air filters are designed to increase horsepower and acceleration while providing excellent filtration. We make over 1,200 different replacement air filters for virtually every vehicle on the road. These filters are washable and reusable and are custom designed to fit into your existing factory air box. Their drop-in design means adding performance is simple. With most vehicles you simply remove the disposable air filter and replace it with a K&N. See applicable instruction sheet for details. Our stock replacement air filters for street vehicles are covered by our famous K&N Million-Mile Limited Warranty™ and will be THE LAST AIR FILTER YOUR VEHICLE WILL EVER NEED.

[More Information on K&N Replacement Air Filters]
  • Designed to boost horsepower and rate of acceleration
  • Can be cleaned and used again
  • High air flow with exceptional filtration
  • Lasts up to 50,000 miles before cleaning is required depending on driving conditions
  • Works with original equipment manufacturer vehicle electronics
  • Emissions legal in all 50 US states
  • Will NOT void vehicle warranty
  • Million Mile Limited Warranty®

Product Specifications

Air Filter ShapeRound
Filter MaterialCotton Gauze
Filter Re-Oiling Amount1.46 oz (43 ml)
Height2.75 in (70 mm)
Inner WireNo
Inside Diameter11.75 in (298 mm)
Outside Diameter13.5 in (343 mm)
Package Contents1 Air Filter
Package Quantity1
Product Box Height14.25 in (362 mm)
Product Box Length14.13 in (359 mm)
Product Box Width4.38 in (111 mm)
Product StyleRound Air Filter
Top Material/FinishNone
Top StyleOpen
Weight2 lb (0.9 kg)

Customer Feedback

Be the first to review part E-3720
Recently fitted one of your air filters to my Nissan GU Patrol, an immediate and notable difference was realized, a lot less pedal to get the vehicle moving and keep it moving, better power and economy, will pay for itself in no time, great product K&N.

Steve Haynes
I bought these two air filters for my 2013 Nissan Altima. I have always used K&N air filters in all of my vehicles. I clean them and reuse them. They are by far the best air filters I have used.

Mark Whipple
Fresno, CA
These allowed me to fit a much larger air filter to a twin turbo Nissan 350Z with a GTM TT kit. The offset allowed the rotating of the filter to avoid hitting the front core/bumper etc. I easily doubled the square inches of filter material/air flow using these. Glad I found them.