An easy way to knock 1.5 db's off f the sound of all of our end caps for 4 strokes.  Since it only has a smaller ID for the length of an inch, it isn't to constrcitive, to where it will hurt power.  It's a designed shape with it's tapers, so that it works well to make quite, without chocking power

   This only fits end cap for bike models 2020 and newer.   

Quiet insert for all 4 stroke BDSB end caps 2020 -23