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The K&N RK-3942 High-Flow Air Intake System increases engine intake airflow and delivers more horsepower & torque to your Harley-Davidson® motorcycle. The intake system increases power by eliminating the stock OE air cleaner and replacing it with a complete High-Flow Air Intake System. The sturdy, custom aluminium backing plate mounts directly to the throttle body via an aluminium integrated, internal-run breather system. The intake system comes with a K&N Air Filter for high airflow and long service intervals. The K&N High-Flow Air Filter is washable, reusable, pre-oiled and ready for installation.

Features:

  • Designed for Harley-Davidson motorcycles.
  • Increase horsepower and torque.
  • Easy to install.
  • Made in the USA.

Specifications:

  • Estima ted Horsepower Gain: 9.32 HP @ 4803 RPM
  • Replacement Filter: E-3980
  • Air Filter Material: Cotton Gauze
  • Air Filter Height: 56mm
  • Inlet Diameter: 33mm
  • Overall Height: 56mm
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K&N Air Filter KRK-3942

by K&N
SKU: KNRK3942
Regular price $431.99 $410.99 5% off
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Alpinestars MC26

Racing/Sport

The K&N RK-3942 High-Flow Air Intake System increases engine intake airflow and delivers more horsepower & torque to your Harley-Davidson® motorcycle. The intake system increases power by eliminating the stock OE air cleaner and replacing it with a complete High-Flow Air Intake System. The sturdy, custom aluminium backing plate mounts directly to the throttle body via an aluminium integrated, internal-run breather system. The intake system comes with a K&N Air Filter for high airflow and long service intervals. The K&N High-Flow Air Filter is washable, reusable, pre-oiled and ready for installation.

Features:

  • Designed for Harley-Davidson motorcycles.
  • Increase horsepower and torque.
  • Easy to install.
  • Made in the USA.

Specifications:

  • Estima ted Horsepower Gain: 9.32 HP @ 4803 RPM
  • Replacement Filter: E-3980
  • Air Filter Material: Cotton Gauze
  • Air Filter Height: 56mm
  • Inlet Diameter: 33mm
  • Overall Height: 56mm