If the AI is removed and the stock airbox is still there it might be to plug the hole in the airbox where the AI hose used to go. Front left upper corner of the box.
Steelheart- '03 Speedmaster Black/Yellow
The Hayabusa Killa
16" Shorties/140 mains/Airbox drilled
Procom CDI
"There is no cure for Celibacy. But we can treat the symptoms."