EGR vacuum line?
 

Does anybody have a pic of what line this is?

You can disable the EGR by blocking it with a BB or something I hear.

There are 2 vacuum lines from behind the right headlight to the turbo. One line goes high to the EGR valve, the other goes low to the ARV just beside the turbo air inlet. You don't need to distinguish the lines because if you're blocking one you might as well block both.

Sixto
87 300D