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K&N Product Information for RK-3931
Custom Assemblies > Filter kit - Harley Davidson

 
K&N's custom air cleaner assemblies are designed with the racer in mind. They incorporate good looks as well as the superior air flow that you expect from K&N. These custom air cleaner assemblies are designed for use with any engine that uses a round element air cleaner housing. They incorporate our famous K&N Air Filters and provide more air flow than other assemblies of this type. Available in 4 different designs, the perfect assembly is sure to be found here. Each complete assembly comes with base, element, and top plate. [MORE]
 
  Part RK-3931 Product Specifications
  Product Style: Custom Assemblies
Estimated Horsepower Gain: 6.54 HP @ 5100 RPM
CARB Exempt: No
Filter Height: 2.125 in (54 mm)
TUV Approved (Europe): No
Replacement Filter: E-3975
Total Height: 2.5 in (64 mm)
Top Style: Metal
CFM: 149.2
Weight: 3.1 lb (1.4 kg)
Product Box Length: 11.56 in (294 mm)
Product Box Width: 9.5 in (241 mm)
Product Box Height: 4.5 in (114 mm)

K&N RK-3931 Inventory Status
USA: In stock
United Kingdom:  Not in stock

Accessories
E-3975 - Replacement Filter

Available Information
RK-3931 Vehicle Applications
Dyno Chart - 2008 Harley Davidson Dyna Street Bob 6.54HP Increase
Installation Instruction Sheet
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News Story - Add 6.5 More Horsepower to Harley Davidson Dyna Models with K&N Custom Intake Assembly


 

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