As SkiBumBrian says, it is the Air Injection System. It is designed to pump air into the exhaust to keep the catalytic converter happy. It does no harm and may keep the cat material from disintegrating.
If you want to remove it, just pull it all off and use a cap to block off the vacuum port at the carb.
Then install the blanking plate SBB was talking about, like this:
The parts fiche is still showing the Fuel Evaporative System as a California item (Kawasaki Motorcycle Parts 2014 KL650EEF KLR650 FUEL EVAPORATIVE SYSTEM (CA)).
It also shows a CN/US tank and a California tank (51001-0368-35P TANK-COMP-FUEL,C.L.GREEN [CA])
This gets somewhat confusing, as California-spec bikes often get delivered to dealers outside of California. I guess it is a supply and demand problem. If they have a surplus of California spec bikes and a need in another part of the country, they'll ship what they have on hand.
The total CA emissions package would be the Air Injection System and a catalytic converter in the muffler, and the evaporative emissions system. I believe that all US bikes have the AIS and cat.
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