One of the pipes went pop yesterday, see image for which one. Tried having a go at putting it back in mut haven't for enough room to get my hands down enough to push it in, would it be worth taking out the headlight and trying to do it that way? It's the bottom end of the pipe under the offside headlights 

I got to it from underneath

Engine undertray off o/s wheel off and plastic arch liner off.

 

Try a pry bar from above , but its more than likley worn if its popping out. 

It goes to the intercooler, like mentioned remove the archliner if your struggling.