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any thing with a audio line out should work,
the get headphone extentions and go for it.
pioner and alpine make some proper ones where you can skip folders ant tracks and stuff on the head unit, but i use the line out method and it works fine.
sort of, youre gonna need to get a $40-60 adapter that goes through the back of your head unit and through your dash so then it goes directly to your head unit using the auxilary setting, i had to do this with my car