Eibach Prokits are actually softer than stock!
According to Eibach, the spring rates for the Prokit springs for 2ga FWD cars is:
Front
Initial 211 lb/in
Final 319 lb/in
Rear
Initial 114 lb/in
Rear 194 lb/in
If you do the math, the fronts are the same stiffness as stock (no stiffer), and the rear are actually lower.
The springs also lower the car between 1 and 1.5 inches, and generally a lowering without an increase in spring rate is a BAD idea, because it gets too easy to hit your bumpstops.
I highly recommend against these parts based solely on the info given to me by Eibach, posted above.
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