K&N RK SERIES HIGH-FLOW AIR INTAKE FOR HARLEY-DAVIDSON® MOTORCYCLES

K&N's RK Series air intake systems have been developed to get more horsepower from your Harley-Davidson® motorcycle. Built around the legendary K&N high-flow air filter, the RK series assembly includes an innovative powder coated, billet aluminum back plate that eliminates external breathers and features a built-in, dyno tuned velocity stack. The result is a significant airflow increase to the engine without sacrificing filtration. This RK series assembly retains a factory appearance by utilizing the stock air cleaner cover.
K&N's RK-3910-1
  • Guaranteed increase in horsepower
  • Replaces the stock air filter and cleaner backing plate assembly
  • Fits behind the OE air cleaner cover maintaining the factory appearance
  • Washable, oversized K&N high-flow air filter equals longer life
  • Oversized black, powder coated aluminum backing plate provides solid mounting
  • Dyno tuned velocity stack directs airflow to engine
  • Built in breathers replace external OE breathers☨
  • Includes K&N Million Mile Limited Warranty®
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K&N Million Mile Limited Warranty
Flare

Select 2008 - 2013 Touring Models*
RK-3930

Torch

Select 2008 - 2013 Sportsters*
RK-3929

Flux

Select 2008 - 2013 Dynas*
RK-3931

RK-3909-1

1-5/8" Tall Filter
Select 2000 - 2007 Touring, Dyna & Softail Models*
Select 2008 - 2012 Softail Models*
RK-3909-1

RK-3910-1

2-1/4" Tall Filter
Select 2000 - 2007 Touring, Dyna & Softail Models*
Select 2008 - 2012 Softail Models*
RK-3910-1

*Click the picture for full application listings.
Find K&N products for your Harley-Davidson or any vehicle using the K&N application search.

*Some air intakes are not legal for highway use in California or other states adopting California emission standards. Click the part number for up-to-date information on emissions legality for specific parts on specific vehicles. Go here for a list of other CARB adoption states.

☨Where applicable
Not Legal For Use in CA & States Adopting CA Emissions Standards

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