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hi guys:) I own a 2007 mazda3, I would like to upgrade the radio with navigation system, can this unit work?http://www.dvdgpsnav.com/mazda-3-dvd-gps-navigation-head-unit-with-bluetooth-radio-tv.html i don't know if my mazda3 has can-bus, do i need to choose this option? Any advices would be...