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reviving old thread to add this image of the shorter stiffer factory US model 991.1 " -20 " Sport PASM springs , taken off a car so equipped , to assist with " color coding " when ordering in future .
caveat : not sure if RWD and AWD models have different springs and not sure which these came off of
Fronts are " Yellow ; Green-Violet "
Rears are " Light Blue ; Green-Orange "
they came off of a C4S ... and the general belief is that the rates differ for 2 vs 4