I am installing an aftermarket FPR, would someone be kind enough to please explain the location of the stock FPR. I thought this was the unit but my aftermarket FPR has an inlet, outlet and one vacume line, what I thought was the stock FPR has 2 vacume lines on each side and just one fule line going into it, how does install of the aftermaket setup work? srry for the poor picture angle.