So if I were building a car without rules, or with rules allowing non-stock steering racks, I would run without power steering. I would experiment with a depowered rack and a manual rack to see if I was more comfortable with the quicker or slower ratio. If I were asking a question about installing a non-stock rack on a forum dedicated to IT cars, I would also expect responders to assume I was asking about an IT car (and based on your post #6 I still am assuming that). I can say that it was worth a relevant amount of HP to run without the pump on the dyno.