Firmer springs and dampers will definitely help the body control and make the car more precise. I expect the stiffened subframe bushings to be a good combination with firmer and lower suspension. The two aspects work together in the way the car is affected by cornering loads. You will end up with a car that is more predictable and steers more accurately. In an ideal situation it would nice to have upgraded anti roll bars as well, but it will probably depend on whether you are flexible with the budget.
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