I am quite sure that the 997 springs will NOT work on a Cayman...the 997 has its motor behind the rear wheels and the cayman in the middle...for sure the spring rates are way different; same thing in the front, the CS has more weight over the front wheels.

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'06 Cayman S -JIC Cross, Quaife, CCW C14 wheels,MPSC's, Milltek cat back, GT3 seats Schroth harnesses, TC design bar, Pagid yellows, GT3 cup brake ducts,de-snorked, vanilla air freshener