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I wanted to keep the original headunit so I bought an adapter that taps into the rear speaker lines at the headunit that gives me my preouts, my gain and fader settings were unchanged but tried altering them to no difference. Its a Fli sub and amp box. Ive got my 12v feed from battery that runs through the firewall with some other wiring and then routed down the side of the car with the standard wiring, the remote wire runs from the adapter to a rocker switch in the glovebox then with the original wiring to the boot same with my rca lines. The earth I have used the rear seat bolts as I was getting a good earth from it.