New K&N Extreme Duty Air Filters Built to Tackle Toughest Environments

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K&N extreme duty air filters are the filter of choice for many racing in dusty off-road environments. K&N's E-3976XD and E-3977XD air filters are a testament to K&N's product development in the off-road industry.
K&N Sponsored Trophy Truck Racer Scott Kincaid
K&N Sponsored Trophy Truck Racer Scott Kincaid


Both K&N air filters deliver superior performance in extreme conditions. As a matter of fact, the “XD” stands for “Extreme Duty”. Baja race trucks in particular can benefit greatly with these filters, which were developed to provide performance and protection for an 800 horsepower race engine enduring the rigorous demands of the Baja 1000 race.
K&N's E-3976XD Extreme Duty Air Filter
K&N's E-3976XD Extreme Duty Air Filter K&N's E-3977XD Extreme Duty Air Filter
K&N's E-3977XD Extreme Duty Air Filter


The E-3976XD and E-3977XD are made with six layers of specially woven cotton media providing excellent filtration efficiency. In addition these filters have a black powdered coated outer wire mesh for extra strength and protection during off-road racing.

The E-3976XD and E-3977XD also utilize a 1-1/4" pleat depth increasing the surface area for optimum dirt capacity.  Both air filters are intended for custom assemblies and are relied on by various Trophy Truck teams competing in the world's most demanding proving grounds. One of those racers who uses an extreme duty K&N air filter is K&N's own Scott Kincaid.

The E-3976XD and E-3977XD have the ability to handle higher amounts of dust and silt found in extreme off road conditions. These K&N air filters are warranted against defective materials or workmanship for one year from date of purchase with no mileage limitation.

The outside diameter and height of the E-3976XD is 16 inches by 5 inches. The outside diameter and height of the E-3977XD is 16 inches by 4 inches.

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 tech@knfilters.com, or visit www.knfilters.com.

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