To get back on track...it's wired into your bike computer. I assume it intercepts and changes the coding for fuel and air ratios and stuff like that. Easier to change than a chip I'd assume, just connect it to a PC, download a new fuel/air "map" and go test.
That being said, for someone with an older model bird with a serial cable style PC, where could he get an extra cable?
Yup, it goes inline between the brain and harness.
I have a box of serial to USB cables sitting behind me right now. PM me your address.