What is this?
 

84 GSL-LE with a completely stock 13b. Just got this car to restore and I am wondering what the vacuum fitting on the lower intake manifold goes to. If the picture that I attached works its what i'm pointing at.

https://cimg7.ibsrv.net/gimg/www.rx7...be3ff7cfc0.jpg

Split air connection. Short piece of black hose connects to a metal pipe that runs to the OEM Cat. This pipe will have a tiny T nipple and piece of hose that operates the Aux Port Acturaters