I'd like to replace the factory head unit on my 2013 WRX but I don't want to lose my connections to the factory mic/aux/USB. I don't really want to run new wires/cables/etc. to connect my iPod, iPhone, or Bluetooth mic. Ideally I'd be able to hook into the factory systems... can't see why it wouldn't be possible - at the very least I should be able to splice into the various wires connecting the aux/USB/and mic systems but if I can find a HU that easily connects them so much the better. Thoughts?