K & N Universal Air Filter RU-1620 Grip Donuts combined with multiple layers of

combined with multiple layers of varying foam densities supported by a foam "spring"

DNA air filter’s flow: 218

Just what your Yamaha XSR900 needs to clean up the tail section from Gravesport

tunes and adjusts your air/fuel ratio for peak performance instantaneously Can fine-tune the non-acceleration air/fuel curves using the Bluetooth® app Works with stock or modified engines

Piston Diameter: Φ12

K & N Universal Air Filter RU-1620 Grip Donuts combined with multiple layers ofMatch the o. d. of your carb throat with the i. d. of the filter (given in inches and millimeters) All clamp directly to the carburetor throat, replacing the stock airbox and filter element