I would be very surprised if you find anything on the spring rates. They dont give it out and I could not get anyone to give me an answer as well. Not even the reps at H&R would respond to that question.
When they made the 350Z versions...same thing. Other users could only guess on the rates based on other spring comparisons.
Though if they really drop the car 1.3 inches...its going to be pretty low. But you will remove pretty much all of the wheel gap. The Tanabe's at .8 ish are pretty low already.
Goodluck though on finding the rates. If you do somehow though...post it up. The look would be pretty nice. Looks wise...comparable to most on coilovers since the average drop seems to be about 1.2-1.4.
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