MRC2005

Hi All, Im new to the riding community and Forums for that matter. I am in need of a few words of advise. I recently purchased a 2005 meanstreak 1600. I had the tank off and noticed that there is an Air cutoff valve that has no hoses attached. There is 1 hose coming up from the righ hand side carbs? (non air filter side) that was loose under the tank just wide open. The bike has upgraded Muzzy exhaust and I assume thats why the the air cutoff is bypassed? The valve is still plugged into the wiring which I assume is needed for the bike to start ect. Do I need to plug that hose off or add a filter? Have not ran it to find out of it pulls air or not.
Thanks