Hey, guys -
I recommend giving SiriusXM a shout, they'll be able to let you know if your vehicle is Sirius-ready or if an aftermarket add-on is necessary:
You can even chat with them live!
FORD IN-VEHICLE TECHNOLOGY TEAM
p: 800.392.FORD (Prompts 1 then 3)
t: @FordService @FordFocus @Ford
f: facebook.com/FordFocus facebook.com/Ford