that comes from your egr valve. just cap them off with rubber vacuum end caps. at this point, the big mess of tubes you have in front of the battery can be removed as well. Well, if you have an aftermarket ecu that removes aiv as well. you can at least delete the egr ones. they connect to the to small rails on the pass side of the plenum. one goes to the throttle body and one to the intake tube. capp them off as well