I've talked to both Eibach and H&R. H&R will not give out spring rate information as they state that there is no standard for measuring spring rates and they don't want people comparing rates.
Eibach did give me numbers for both stock and their springs which I have at work and post them tomorrow. Based on Eibach's measurements, their springs are 10% stiffer in the front and 20% stiffer in the rear which I believe will reduce understeer to some degree.
Thanks,
Barry
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