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Old 02-14-2012, 10:34 AM   #4 (permalink)
370Zfeeler
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OEM Spring Rates
F: (7.5 kgf/mm) R: (8.1 kgf/mm)

Tein S-tech
F: 8.5kg (-0.9") R 9.4kg (-0.7")

Eibach pro kit
F: 8.6kg (-0.9") R 9.5kg (-0.8")

This is what i found doing a search. Seems pretty close between the two, and both are listed as progressive springs
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