On the back side of the LIM on my s5 N/A there is a hose that just seems to be dangling there. It sits about an inch inward of the hose that I believe goes to the break booster via a banjo fitting. The hose in question is about 3/4" wide, and looks to have had a wire clamp on it at one time. My car doesn't idle roughly or seem to suffer any ill effects from this hose being disconnected, but it does worry me as I dont like the idea of a gaping hole in my mainfold. Any ideas what it is????

 

could be the hose that goes to the air split pipe maybe ??

 

A pic would be very helpful

 

I did a bit more searching and it seems as if you were correct, thanks a bunch