aftermarket custom spring rates for JRZ suspension

I’m working with a couple of vendors on sourcing a JRZ RS1 suspension setup from the Netherlands. I’m decided on the dampers but I’m not firm yet on which spring rates I should choose, or even which spring manufacturer top of the line. I’ve heard good things about Swift; I know less about Hyperco. All in this is going to run me about $3600 plus CA sales tax and freight from Europe.

From the expert:

“I am thinking something around a 500 front and 650-750 rear would be a very nice package. This will have satisfactory ride and enough platform for track days. We can make the dampers and hardware such that OE ride height and 2” lower can be achieved."