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Properly made springs do not get weaker over time. It is possible for them to get abraded (if bushings have sagged) and rust, which can cause them to snap, but otherwise the spring rate will stay the same. So don't waste money with stock rates.
FWIW, I use 22/31 with no sway bars, front Konis, rear Bilstein yellows, I like it. Probably can do better on the dampers though. Car is 2200 pounds with fuel and driver.
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1971 911S, 2.7RS spec MFI engine, suspension mods, lightened
Suspension by Rebel Racing, Serviced by TLG Auto, Brakes by PMB Performance
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