I am doing some service on the bike and found a thing on the bike that I have never seen before and I wonder what it is for?

On the rubber joint that connects the throttle body to the airbox there is a small plastic box that does not lead to anything.




You can see it on this picture from KEV where it sits on the top of the joint.

And also in the parts manual it is not described at all. Even in the Service manual it is not mentioned at all.



So does anyone know what it is? I guess it is a resonance chamber? or a preparation for some kind of fume recirculation for places with strict environmental rules e.g California.

I think it would be ok to remove it as the stage 3 airbox does not have it and neither does the XT660Z. And just plug the hole.