the manufacturers' usually offer different spec's of setups...
TANABE has a HARD version of their kits that has a higher spring rate etc...
TEIN has 2 versions of their flex for the Z33... One with 12K FR / RR that is regularly stocked in the US market, and 10K FR / RR that is regularly stocked for the JDM market... but can order it either way...
But, you will see with most setups there is usually a softer set up and a harsher set up......
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