Was wondering what spring rate to use. I have a 03 mustangGT 800rwhp battery in the trunk and 80lb water resivoir, corbeau seats roll bar and tubular front suspension with coilover and 200lb drag springs. My options from UPR QA1 coil over kit are 130, 150, 170
My suggestion is to get the car scaled and then call Dave from Team Z to have him help you pick the spring rate.
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