RK-3947 K&N Intake System-Harley Davidson

$228.99
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SKU
RK-3947
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Intake System-Harley Davidson
The K&N RK-3947 High-Flow Air Intake System increases engine intake airflow and delivers more horsepower & torque to many Harley-Davidson FLT and FLH model motorcycles. The intake system increases power by eliminating the stock OE air cleaner and replacing it with a complete High-Flow Air Intake System. The intake system comes with a K&N air filter for high air flow and long service intervals. The K&N high-flow air filter is washable, reusable, pre-oiled and ready for installation.
  • Guaranteed increase in horsepower
  • Replaces the stock air filter and cleaner backing plate assembly
  • Washable, oversized K&N high-flow air filter for long service interval
  • 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
Estimated Horsepower Gain7.43 HP @ 4786 RPM
Replacement FilterE-3975
Air Filter ColorRed
Air Filter MaterialCotton Gauze
Warranty1,000,000 Miles/10 Year
Product StyleMotorcycle Intake System
Air Filter Height2.125 in (54 mm)
CARB EO NumberD-269-59
Street Legal In All US StatesSee Vehicle Applications
TUV Approved (Europe)No
Overall Height2.125 in (54 mm)
Top MaterialChrome
Package Quantity1
Weight4.3 lb (2 kg)
Product Box Height4.88 in (124 mm)
Product Box Length11.75 in (298 mm)
Product Box Width9.5 in (241 mm)
Mounting Hardware IncludedYes
Cross References
Harley-Davidson 2925308B
Vance & Hines 70041

Warning: Cancer & Reproductive Harm – P65Warnings.ca.gov

K&N Products

Unmatched Performance

50 years of improving vehicle performance.

intake

Cold Air Intakes

Custom-engineered tubes deliver better airflow than you get with a stock intake. More air means better performance.

air filters

Air Filters

Using cotton gauze instead of typical folded paper, our filters increase airflow while providing excellent engine protection.

cabin air filter

Cabin Air Filters

Helps capture most mold, mildew, fungus, spores, bacteria, germs, pollen and allergens, and helps to rid the air of unpleasant odors.

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Oil Filters

K&N oil filters use a high flow filter media that allows for high flow rates while providing outstanding engine protection.

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Speed Shop

From custom air filters to fuel pumps and carb accessories, the K&N Speed Shop has been assembled to help your vehicle run at peak performance.

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Home Air Filters

New washable and reusable air conditioning and furnace filters for your home. From the industry leader in washable automotive filtration.

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FUEL FILTERS

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CLEANING KITS

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HD DIESEL

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POWERSPORTS

OUR STORY

WHY K&N?


K&N is the home of the original red oiled air filter. In the early 1960s, two motorcycle racers, Ken Johnson and Norm McDonald (K&N), developed a ground-breaking new idea for an oiled air filter. Five decades later, K&N® is still innovating industry-leading filtration technology, and offers outstanding protection for everything from top-fuel dragsters to commuter vehicles across the globe. Thank you for helping us reach 50 years in business!


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