I would take an initial height setting from someone like Ernie who has put in the work then corner balance to refine. Rake will have a more profound affect on braking than handling. Taking some rake out will allow the rears to do more of the work. Baseline ride heights need to take into account a lot of factors like: will it be driven on the street, are you a curb attacker, do the coilovers offer enough adjustment range at the given height to properly corner balance, are you still in an optimal alignment range, etc?

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2008 Cayman S, Black, Floormats