All pipes are connected, the airbox has the 2x clear bungs on the pipes. It it just the nipple on the throttle body that I cannot find a place to connect the other end of the pipe too, unless it is just meant to be blanked. ? I have had airbox off and all pipes are connected and there are no places to connect in an extra pipe
this looks to be the pipe nipple on the diagram, the throttle body is the rear one and the pipe exits to the left, if I cover the pipe the bike idles ok, I am presuming it connects into somewhere but cannot find a corresponding point or a loose tube