1st. fake racers are dummy cars(those you see in valo), this is not(as you said is a cpu opponent)
2nd. you can build the car you prefer and save it from main menu as Drag_car(or something like that) so if it works on your garage will also work on track
3rd. you can also load the Drag_car from main menu, insert "ilikecheating" and fix it, then save instead of the original/not working one
With so much drama in the V-S-T, it's kinda hard being Bigg B-O-double-S-ninetythree