Vacuum Pipe - Where to?

[Kyzza]

Hey all,

I'm just wondering if anyone knows where the vacuum pipe (see attached image) should be connected to?

I found it dangling down next to the exhaust manifold, it looks like it might have been burnt a bit...

Thanks in advance!

[MinorMatt]

The end is missing, but it goes to a little spigot on the top of the airbox between the main pipe and the back of the box...