New Air Filter for Select Indian Motorcycle Applications Released

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K&N Custom Air Filter E-3971
K&N Custom Air Filter E-3971
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. K&N replacement motorcycle air filters are 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 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 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.

Find K&N products for your vehicle using the K&N application search then use the K&N dealer search to find a K&N dealer in your part of the world.

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K&N Engineering, Inc., with headquarters in Riverside, California, has been the world's leader in performance filter technology since 1969, serving the needs of the automotive, motorcycle, marine, industrial and military markets. K&N is heavily involved in nearly every form of motorsports from off-road and powersports to drag racing, stock cars and road racing. For more information about K&N Filters, please contact K&N Engineering, Inc., P.O. Box 1329, Riverside, CA 92502-1329, (800) 213-4182 for a dealer near you, (800) 858-3333 for technical service/questions, (951) 826-4001 Fax, e-mail, or visit