Okay, who's the resident electrical boffin who can explain what the signal is that leaves the accelerator pedal and makes its way to the throttle body?

Systems like iDrive, Stealth and other throttle controllers exist to modify and increase response, so what is it that they're changing? Voltage outputs?

Is the reason they're a pricey complicated unit because they're adjustable?

Can we not just add resistors between the pedal and the harness?

Yuhp... Interested. Was looking at a few interesting concepts in this regard also...

You have BF2 with the later throttle system (same as FG I presume)?

Nope - BA2, what's the difference?