1.I am sorry it can't.
2.No, don't need.
3.We can provide the map link for you to download.
4.Please download the map by your computer, the copy the map to SD card, then run on this unit.
Then copy the map to SD card, then insert the SD card to run on this unit.
5.Yes, we will provide all the cables. If you want to install it by yourself, you just need install tools.
6.Yes, this unit can support wifi and 3G. we will provide the 3G & wifi dongle in the package to you.
7.You need to buy one SIM card to insert into the 3G dongle we provide, then you can surf internet via 3G.
8.Yes.
9.Yes, all the wirings are similar. we recommend this one to you. The screen is 9 inch: http://www.seicane.com/headrest-dvd-player-9-inch-with-fm-games-and-zipper-cover-1-pair-sf-999-1
10.No, there will be no function lost.
11.We are in china. Yes, warranty is one year.
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Seicane