If you had the airbox and intake off i know it's very easy to get almost all of it on the top of the carbs and almost all of the elbow back onto the side of the airbox. That would create a decent sized air leak which it may idle but under good throttle would be sucking in may air than the carbs can handle with current jets.
07 vstar 650 midnight custom
Ais disable, 4.5 inch risers, V&H cruzers, jetted with pods, viking saddlebags, Kuryakyn mini boards and memphis fats windshield, fuel solenoids deleted, star solo seat and 4 inch extensions. Boss audio sound system.