Yes preloaded files are on every X4
You can order the total amount of custom files that you want to.
They are relative, the advantage to the BDX is that it will work on multiple brands where as the Ford X4 works on Fords only.
The device can hold 10 custom tune files. You can order it right here
http://www.unleashedtuning.com/unleashed-custom-tuning-for-mustang-2-3l-ecoboost/
I don't see it as a requirement.
The modes are intact and function as they do now except with more power
You get as many custom tune files as you order with the device.
All programmers purchased from me get post sale calibration support with email revisions for normal boltons.
Current SCT and...