From the SRT page-----Engineers achieved this objective by increasing the Coupe’s spring rates to 451 pounds per inch in front and 480 pounds per inch in the rear. Roadster spring rates are 431 pounds per inch in front and 491 pounds per inch in the rear -- over 100 pounds per inch stiffer than the base Crossfire coupe and roadster. Many on here have cut the springs to lower the car---You may want to buy an used set and do this---Just a thought---Jimmy