Handsfree phone kit for Subaru Impreza RS
How do I install a handsfree car kit into a MY08 Subaru Impreza RS?
I'm after details of any existing factory wiring for:
* voice input into the stereo
* constant power, switched power, and ground
If wiring exists from the factory, where is it located, and are there any tips for installing a generic handsfree mobile telephone kit?