It used to connect to the air box (where the air filter lives). A large number of owners have removed all of that stuff. There are block off plates available, from any number of sources, to do exactly what you are asking about. Here is one source...
http://www.ebay.com/itm/like/3909244...lpid=82&chn=ps
Or, one can be easily made. I used a hacksaw, a piece of the angle iron from the cage the scooter arrived in, a drill, and a grinder.