I just reinstalled my supercharger, and i have a hiss now.

It's a vacuum line, because i can feel it sucking air.

But i cant find where it goes. It comes from the plastic tube from the supercharger to the TB.

Maybe the internets can help.... Pics attached.

 

This seems to be my same problem, Funny, because it didnt come up in a search, i was searching google...

https://www.northamericanmotoring.com/forums/stock-problems-issues/127352-vacuum-hose-identification-help.html

 

I believe it goes to the TMAP sensor, it connects from the sensor to the charge pipe.
#20 in this diagram http://www.realoem.com/bmw/showparts...35&hg=17&fg=05

 

It's from the MAP sensor going to the supercharger intake duct. You can replace it with a new one or fix it like this.