It is stiffer than the Stillen though.
The Eibach is much thicker than I first thought, thanks for the numbers.
The spring rates for the Hotchkis rear are:
930, 1160, 1490 lbs/in (based on the 28.5mm bar)
+70, 110, 170% stiffer than stock 370Z
The Eibach rear sounds crazy stiff if their numbers are accurate.
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