K&N Engineering has been designing, manufacturing, and enhancing High-Flow Air Filters for the automotive and motorcycle enthusiast since 1969. Each filter is design to increase horsepower and acceleration. The K&N replacement motorcycle air filter is ideal for extended use in dirty and dusty conditions and provide clean carburetion even at high altitude. Our filters are washable, reusable and covered by the famous K&N Million Mile Limited Warranty^®.

K&N introduces the E-3971 which allows virtually unrestricted airflow while providing excellent filtration. “The E-3971 is a replacement motorcycle air filter that can fit select Indian motorcycle applications,” says Tom Brown, Project Manager at K&N Engineering. “It is 1/4” taller than the E-3226 so it has more filter media allowing additional flow capabilities.”

The E-3971 is a custom motorcycle air filter 2.75 inches in height with an inside diameter of 4.625 inches and an outside diameter of 6”. This filter will fit any application meeting these requirements.

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