From what I've read, the big vacuum line on the back of the UIM somehow works in conjunction with the OMP? I ask this because mine is capped off. Where is this line supposed to be connected to?

 

Please delete this post, I'm an idiot and was looking at the wrong vac hose

 

It's actually a fresh air line, not a vacuum line. There should be a "spider" of hoses leading up from each oil dribbler to the nipple on the throttle body. It is NORMAL to have some capped lines on the upper intake, so make sure the one you are worried about is actually supposed to be used. On the stock S4 NA, there is a large nipple that is capped on the back of the throttle body that is used for the kickdown on the auto transmission. Obviously, this is not used on 5 speed cars.

 

Thanks Aaron, you are absolutely right. I guess I need to think before I panic next time