K&N's DryCharger material is made from durable polyester pre-treated with a proprietary hydrophobic process. It can be used to make a filter wrap for sizes that are not currently available. This material is designed to prevent splashes of water ormud from saturating your K&N air filter. It will also stop small dirt particles while adding little restriction to the airflow of the filter. DryCharger material is a water repellent. It is not water proof. Depending on conditions and usage the water repellent treatment is good for 1 to 2 years.

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K&N 20% Off Select Filters Quarter 3 Promo Sale

KN20%OFFSELECTFILTERSQ3SALE2026

K&N's 20% Off Select Air and Cabin Filters Quarter 3 Promo Sale, running from July 21, 2026, through August 24, 2026. For a limited time, customers can save up to 20% off select air and cabin filters across the K&N, AEM, Airaid lineup, making it the perfect opportunity to upgrade with high-quality Air and Cabin Filters. The sale prices are applicable only to purchases made within the specified sale period, from July 21, 2026, through August 24, 2026. No rainchecks or exceptions will be provided. Regular MAP Pricing will be reinforced on August 25, 2026. This sale cannot be combined with any other offers, discounts, or promotions. Co-ops will be honored.

Warranty Information

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K&N Warranty Info (PDF)

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K&N 25-3901 Specifications

KEY SPECS
MFG. Part #	25-3901
Brand	K&N

GENERAL
Color	Black
GTIN Code	024844340375
Overall Length	58"
Overall Width	36"
Material Type	Silicone Treated Polyester
Wrap Type	Drycharger

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