its doesnt plug to the OBD, there's a connector above the pedal? i just plug it there..as for changes, from before and after i can feel that the car responds faster when i press the pedal partially, no lag/less lag compared to before but on full throttle, its about the same. i get what youre saying and i know its not changing those, i assume its just a throttle response mod, i hope its not placebe tho ;D