Originally Posted by _RED_
Stand alones are an option but you lose a lot with their use. If you are making a dedicated race car it would be a different story. But for a street driven focus it is over kill.
You would need to talk to the manufacture of the system but, you shouldn't loose a single thing by going to a standalone. At least, not with a modern CANBUS system.
I wouldn't say a standalone is overkill for a street car...Its all about how much control you want over the systems. I have a standalone in my car and, its just a street car with all the amenities it came with from the factory. I didn't loose a single thing with it.