K&N RC-3680 Universal Clamp-On Air Filter

Universal Air Filters / Universal Clamp-On Air Filter
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$47.99 USD
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Product Overview

  • Designed to increase horsepower and acceleration
  • Hundreds of sizes and shapes for most applications
  • High air flow with excellent filtration
  • Clamp-on washable and reusable air filter
  • Malleable flanges
  • One year limited warranty
K&N's Universal Air Filters are designed and manufactured for a wide variety of applications including racing vehicles, radio-controlled cars, generators, snowmobiles, tractors, and other applications. Regardless of the angle or offset diameter of the air intake, there is probably a K&N Universal air filter for your equipment. All filters are constructed with ultra-strong molded pliable rubber flanges which absorb vibration and allow for secure attachment and can also be stretched for up to 1/16 of an inch (1.5mm) to fit in-between sizes. K&N universal air filters are washable and reusable.

[More Information on Universal Air Filters]
Base Outside Length4.5 in (114 mm)
Base Outside Width3.75 in (95 mm)
Filter MaterialCotton Gauze
Flange Inside Diameter2.438 in (62 mm)
Flange Length0.625 in (16 mm)
Flange TypeCentered
Height6 in (152 mm)
Top Outside Length3 in (76 mm)
Top Outside Width2 in (51 mm)
Top StyleMetal
Top MaterialChrome
Air Filter ShapeOval Straight
Package Contents1 Air Filter
Package Quantity1
Warranty1 Year Limited
Product StyleOval Tapered Universal Air Filter
Weight0.8 lb (0.4 kg)
Filter Re-Oiling Amount0.59 oz (18 ml)
Product Box Height7.25 in (184 mm)
Product Box Length4.63 in (117 mm)
Product Box Width4.63 in (117 mm)
Inner WireNo
WARNING: Cancer and reproductive

K&N RC-3680 Universal Clamp-On Air Filter Product Reviews

Monday, April 15, 2019 - Part RC-3680
I was a bit disappointed at the finishing particularly at the top end of the filter as it faces upwards and as it’s on a Harley Davidson it’s always in full view and not under a bonnet, photo attached.looks like it might have gotten squeezed but box is perfect.

Luis Nunes
Loule, Portugal
Friday, March 22, 2019 - Part RC-3680
Excellent service from the guys at K&N and the online store. The quality of the filters are second to none. Couldn’t recommend K&N more highly.

Garrett O’Donoghue
Greensborough, Australia
Monday, November 26, 2018 - Part RC-3680
I do not have any photos of the Harley Sportster this filter was purchased for. I bought this and one for my 2014 Mustang GT with an AirRaid Cold Air Intake. I'm pleased with the K&N filters, however I'm unhappy that at the time I ordered them there was a benefit for spending a certain amount of $. Some sort of free gift or something and I did not receive it. Thank you for your consideration. Doug Smith

Douglas Smith
Minden, United States