looks like the person that put the aftermarket exhaust on the bike disabled the Air Injection System (AIS).
Its function is to pump fresh air thru the exhaust to burn off fuel in the catalytic converter. Very few after market exhaust pipes have cats so its common to disable the AIS. It does not improve or harm the operation of the engine to disable it.
Most people take all the AIS hoses and pump off the bike, to make the engine look better/cleaner. In california you are suppose to keep it on the bike, so people find clever ways to disable it so you cant tell its been blocked. Some people get confused and do that when they dont really need to (instead of just taking it all off the bike).
Before you rip it all out talk to a dealer mechanic and see if keeping it is required in your state for the vehicle inspection. When the bike is inspected they have no way of telling if the AIS has been blocked, but if its all missing and it is required in your state, the bike will fail the inspection.
Last edited by KCW; 10-21-2018 at 05:33 AM.