for a touring car the torque isn't that vital. anything above 5-6kg would be fine. It;s the speed that helps most, enabling you to react to slides etc and correct them before the car spins. You would ideally look for something around 0.1s/60 degrees, or faster. But on your budget you would probably have to settle for around 0.12-0.14s, which is still a damn site faster than the 0.25s+ that bog standard servos move.
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