in the kick panel by the drivers left foot (also available on passengers right) are boxes with various (switched/non-switched etc.) wires available. fwiw I installed the Ford OEM system which works off your current key fob. It's a decent system but the first time installing it should take 8 hrs. It took me lots longer but I ran into problems (not my fault I swear). You can get them for $125 online.
2012 V6 with suspension, shifting, stopping and sound mods.