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Custom Assemblies > Custom Air Filter

 List Price: $153.13
Your Price: $103.99

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The K&N RT-3910 Custom Air Filter converts the RK-Series Air Filter Assembly (RK-3909) with a taller K&N Air Filter and longer spacers. It is designed for Harley owners who need more air for better performance.
  • Replacement filter for RK-3909
  • Washable and reusable
  • Low restriction
  • Comes with spacers and thread locker
Available Information
Installation Instruction Sheet
News Story - Harley Davidson Motorcyle Owners Gain Performance with K&N Custom Assembly
News Story - Adding Performance to Harley Davidson® Motorcycles is Easy with K&N

Part RT-3910 Product Specifications
Product Style: Unique Air Filters
Air Filter Shape: Oval
Filter Material: Cotton Gauze
Flanges: None
Height: 2.25 in (57 mm)
Package Contents: 1 Air Filter
Package Quantity: 1
Air Filter Height: 2 in (51 mm)
Air Filter Material: Cotton Gauze
California Restricted: Not legal for sale or use in California
Color: Red
Inlet Diameter: 2.25 in (57 mm)
Length: 8.813 in (224 mm)
Mounting Hardware Included: Yes
Overall Height: 2.5 in (64 mm)
Replacement Filter: E-3037
Top Material/Finish: Black Powder Coated
Width: 6.188 in (157 mm)
Weight: 1.5 lb (0.7 kg)
Product Box Length: 8.5 in (216 mm)
Product Box Width: 8.5 in (216 mm)
Product Box Height: 3.63 in (92 mm)

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