Its from air injection system ..Have u still got it? as I can see yes coz can see tube coming off the inlet manifold ...u should buy and install AI removal kit
Grzegorz ......55 cubic inches http://www.flickr.com/photos/25172906@N06/ 904WisecoTPUSAcamsTTPignitorgutted Airbox"breath"airIntakeKeihinCR-ScarbsBlackEpcoExhaustS/SwheelsPortedPolishedHead