The 48 Hour Camaro started out with 600# and 200#, which would be great for a daily driver that is occasionally autocrossed. We increased the rates for a big track event, and have kept it that way for now.
I wouldn't go any heavier on a similar street car!
If you put good information into the spring rate calculator TRUST THE RESULTS. We spent a lot of time making sure it worked correctly (how many other manufacturers provide this?) We use it all the time, and it's typically dead on, especially now that it lets the customer choose his/her use of the vehicle.
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