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This might have been discussed before. Just wondering about the difference of the recommanded spring rate between RaceTech and Penske. I know that the rate given by Penske chart for a range between 120~160lbs (with gear), and you have to manually input the variables with RaceTech. Still there is rate difference of 90~60lbs, with RaceTech recommanding a softer rate.
Having said that, I do believe some people do run rates that are out of the recommanded range?