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Why would you turn your car into an exercise in suspension design? Suspensions are systems that must work together. Urethane comes in a wide range of dura (hardness), coils in a wide range of rate and dampers across the board on the critical damping scale. Find a GTO with suspension mods you are considering and arrange a test ride / drive. You should know what you want and what you will get before you start spending your money.
