I have just bought an import WRX STi 1997 which has the STi/Prodrive/Bilstein with Eibach Blue Springs. I phoned Eibach to find out the spring rates and was told these are top secret !!!!!.
Front 20400550410
Rear 2230055060

Anyone know what rates they use, It would save me taking them apart.

 

You could try PM'ing MikeWood on here (he works for Prodrive) and ask if he can divulge them.

 

If they are the same as the P1 then they are listed here - http://www.northursalia.com/techdocs/spring/spring.html

 

I should be able to find out for you but it may take a little time. Could I ask why you need to know?

Regards

Mike