Hey guys, new to the forum. I'm helping a buddy out with his intake on a 2001 c320 3.2L Auto tranny. In the process of reassembling the manifold and everything, we've run into a a vacuum hose that doesn't seem to go anywhere... It's on the back of the manifold right underneath the EGR outlet. I've attached a photo (ignore the white erasing, its the circled nipple) that shows the nipple. This is the best photo I could find online that actually shows the nipple but I can't find ANYWHERE that shows a vacuum routing diagram that would tell me where it actually goes. Any ideas guys? Thanks!!!

 

I've also found this image several times but it shows the nipple not having anything on it. Is it supposed to be disconnected or is that just deceiving from the photo?