you can easily do it
here is install instructions for the pxhgm4 option that would connect to the back of the radio
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HI
You can add th eXM unit by using the PXDX kist from Pac Audio
however you will need one for each car
the pxdx and pxhgm4 option for the Z which connects to the back of your radio
http://shop.doubledmods.com/ZUNE-C5-...?categoryId=-1
and the pxdx and pxhgm2 option to connect to the cd changer
http://shop.doubledmods.com/ZUNE-C5-...?categoryId=-1
You wont be able to pull from one car to another easily becuase you have no changer option ont he Z

antenna
anywhere as long as its horizontal for best reception is all
call me if you need to
608 568 3011