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Well, I got some prelim info:
FE2 springs (front and rear) : 125 lbs/in and 175 lbs/in
FE3 springs (Z0K and GXP/RedLine) (front and rear) : 170 lbs/in and 225 lbs/in
This is close to the Eibach spring rates, IIRC.
The Z0K springs have a shorter free length, and lower the car by 1/2".
GMPP springs: 210 lbs/in and 285 lbs/in
These have a slightly shorter free length and load, so they lower the car a tiny bit.
Now, if you put the GMPP springs on your car, you're into street prepared autoX category... so keep that in mind.
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