Well the vacuum line that runs from the FPR to the intake manifold is taken out. then the appropriate lines which are marked on the control box and in instructions, run into the intake and one to the FPR. you basically run the line from the intake mani to the box then out of the box to the FPR and when it is activated it boosts the pressure to the FPR to deliver more fuel. I'll try to get some pics if I can but it's pretty simple. Send me a message or email me if ya need more help.