The K&N HD-1717 is a replacement element for the factory air filter on the 2017 Harley-Davidson FLHR Road King, which uses the 107 CI engine. The manufacturer calls it a replacement for the stock motorcycle air filter element and says it is custom engineered to fit the specific application. Its filter media is pleated for a large filtration area, with multiple layers of woven cotton gauze. The manufacturer also states the design is intended to increase horsepower and torque, and real gains will depend on the rest of your intake and exhaust.
Compared with a generic universal filter, the main reason to buy this unit is the fit. The application-specific base seal and sealing bead are what keep unfiltered air from bypassing the element at the airbox, so a cheaper filter that doesn't match the Road King housing can undo the gain it promises. Owners searching for a 2017 Road King air filter, a K&N FLHR replacement element, or a 107 CI intake filter upgrade usually want a drop-in part that doesn't require modifying the airbox, and this is built for that use.
The manufacturer's product page for the FLHR Road King lists 2017 through 2020. Fitment details vary across sources for later years, so confirm your model year with the manufacturer before ordering.
The manufacturer presents it as a direct replacement for the stock element, custom engineered for the specific application with a focus on low restriction, increased performance, and engine protection.
