Its just a network connection that controls every aspect of the car, including airbags, abs, engine, gearbox, attessa. I love modifying cars but I draw the line at that and driving the electronic throttle manually. If theres a fault detected it could immediately go into limp mode and drop all power, worst case full throttle? In a cable throttle car you have control and can always shut the air off, not ours.
If you really must get rid of the speed limiter, for a few hundred more you can get a reflashed ecu from Japan.