I just bought a Subaru Impreza 2012 2.0i Sedan. I am trying to upgrade the head unit and all four speakers and I don't know what I need to do so. The head unit that I purchased is the Alpine CDE-103BT. The speakers I purchased are the Alpine Sps-610 6.5" for the front and Alpine Sps-510 5.25" for the back. How do I go about installing the head unit and connecting the speakers? All help is greatly appreciated! If anyone can provide links on what needs to be purchased, that would be fantastic. Thanks a lot!