K&N® Offers Performance Air Intake Systems for Harley-Davidson Motorcycles

For motorcyclists dedicated to the iconic Harley-Davidson brand—and interested in a guaranteed increase in horsepower and torque—K&N® offers performance-enhancing air intake systems available in multiple styles and finishes for H-D motorcycles, now available and 50-state legal for hundreds of additional models. Protect your engine from most harmful dust, dirt, and contaminants, and reap benefits including a guaranteed increase in horsepower and torque, top-quality engine protection, and robust engine sounds on acceleration.

2010 FXDF Dyna Fat Bob with 1584CC engine is compatible with the RK-3931 intake system

[Please note that using a K&N replacement air intake system will not void your factory warranty; in the U.S., manufacturers must provide evidence that an aftermarket part is the cause of a necessary repair in order to void or deny warranty coverage. The Consumer Products Warranty Act of 1975 (also known as the Magnuson-Moss Warranty Act) protects consumers’ rights to their warranty coverage.]

The 2008 FXDF Dyna Street Bob with 1584CC engine is compatible with the RK-3930X and RK-3952 intakes

RK SERIES INTAKE SYSTEMS

RK Series Intake Systems feature an oversized K&N® High-Flow™ Air Filter, dyno-tuned velocity stack, and integrated breather system—helping to provide a significant increase in airflow and engine performance. RK intake systems fit neatly behind the factory air cleaner cover to maintain a stock appearance, and come in either a standard capacity or large capacity style depending on your performance needs.

The RK Series RK-3943 after installation, hidden discreetly behind the air cleaner cover

• Custom aluminum backing plate provides solid mounting surface

• Built-in breathers replace external OE breathers

• Oversized K&N High-Flow™ Air Filter for excellent filtration and contaminant protection

• Built-in dyno-tuned velocity-stack to direct airflow to the throttle body

• Available in standard or large capacity

• 10-Year/Million Mile Limited Warranty

Chuck from Missouri says: “Best value I found on a great looking intake. Classic, clean, and well-engineered. Also get the quality and reliability that comes with K&N products. Thanks for recognizing the need to build a quality piece around your filter.” [Product #: RK-3932]

Brad from Texas says: “Absolutely love it. I was very much impressed on the increase in power and throaty intake sound.... highly recommended.” [Product #: RK-3930]

AIRCHARGER® INTAKE SYSTEMS

The 63-1137 Aircharger® intake system is available in both black and silver finishes

• Guaranteed to increase horsepower

• Custom aluminum throttle-body mounting plate

• Includes complete breather assembly and mounting hardware

• Available in bright mirror, textured silver, or textured black finish

• High-Flow™ Air Filter provides outstanding performance and protection

• 10-Year/Million Mile Limited Warranty

Bryan from New York says: “Absolutely love this setup. Substantial differences noticed. Acceleration, performance, engine sound. Would definitely recommend.” [Product #: 63-1125]

Thomas from Wisconsin says: “The instructions were easy to follow and it took about a half an hour to install. And I like the look. WOW! I was not expecting the engine to respond the way it has. I definitely feel the increase in power. Thanks K&N.” [Product #: 63-1125P]

STREET METAL™ INTAKE SYSTEMS

The Street Shaker in silver (RK-3950S) after installation

• Guaranteed to increase horsepower

• Aluminum backing plate with integrated velocity stack provides solid mounting surface

• Built-in breathers replace external OE breathers

• High-quality aluminum cover

• Oversized K&N High-Flow™ Air Filter for excellent filtration and long service intervals

• Built-in dyno-tuned velocity-stack directs airflow to the throttle body

• 10-Year/Million Mile Limited Warranty

The Street Sidedraft (RK-3953S)

Dalton from Virginia says: “This intake works very well, especially if you have any kind of work done to your motor to include cams or a tune. I have mid controls and I was worried about it hitting my knee but I have not had that problem, even when riding my bike to full potential. I would definitely recommend this intake to anyone who seriously wants to feel instant power.” [Product #: RK-3933XB]

Part numbers for various H-D models are listed below (all 50-state legal). Please visit www.knfilters.com to search for a complete list of products for your model and year.