Ideally you want all four wheels on the ground. But a properly tuned car within STS limits might actually be fastest with some slight lift in the hard bends. There's so little weight back there that you might be able to have just one tire keep the whole back of the car in line! However, when you're way up like I was, the front outside tire is in a VERY unhappy place, and you'll not be very quick. That was definetly too much rear bar for those springs, and I would have been faster with a softer bar, had I kept the stock springs.