lip spoiler that is underneath inside the Vr4 bumper. In order for the rear spoiler to work you would also need the front spoiler which is about $1200 and get the wiring harness to connect the front and rear to work. So wouldnt be a good suggestion for wiring.
But if you got something else in mind just to control the rear spoiler with your own custom made aerodynamic switch for the spoiler, then its in your hands to decide