The principle advantages of the Livewire over the X4 and BDX are that it has a larger screen than either of them, and it's a gull touchscreen display which makes it an easier to use and effective monitoring device. The BDX and X4 just have button interfaces which makes it a bit more tedious to change display settings and gauges while driving. Not SCT/Bully Dog device can currently tune on the fly on Ford gas-powered vehicles. All of the devices can hold up to 10 custom tunes, though only a single tune can be uploaded at a time. The device comes with three tunes as standard. 4th and 5th tunes are available at an additional cost of $10 a piece.