Isn't that the pipe you change for the fpr mod? If your keeping it there then the other end connects to the nozzle on the fuel rail or around that area. If you want to do the fpr mod then the one end goes in the same place and the end that is on the intake pipe goes on the nozzle that has a bung on under the inlet manifold area. You then use the bung you have just took off and put it on the now unused nozzle on the inlet.
This is of course if you haven't already done the mod and the fact your on about what's in the red circle bid not then I've just wasted both our times lol