Move it behind your second cat (or only cat now). That will prevent you getting a CEL. You'll have to extend the wires though, as it won't reach.
Be sure to put the O2 sensor with the black connector in by the turbo and the gray one behind the cat (it only measures cat efficiency), but the black one is used by the ECU to set A/F
How's that for help?
Any more questions. . .holler or PM me. . .I'll do what I can.