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new springs for PSS9's

Suspension and Steering

Model: 964 RSA, Year:1993, Mileage:104K, Type of use:Both Street & Track
I purchased PSS9's 3 years ago for my RSA. Was a worth while investment and I am now looking for a more track tuned setup. I plan to change the springs and was wondering what the maximum spring rates are for the 964 PSS9's without having to revalve the shocks? If I have to revalve, not a big deal, just curious to see if I could get a 400/600 or 500/700 spring rate setup with what I have. I understand the stock rates to be 275/400 ( F/R ). I would like to get as close to a 964 cup setup as possible. Thanks in advance. RM.

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