Anyone heard of these srpings? I guess they were discontinued.... Spring rates are 223-448 lb/in front and 97-136 lb/in rear..... anyone know if they are any good??

 

Those are part of the Bilstein package for 00-02 Firehawk/SS cars from SLP. Lowers the car about .75" from stock. They should be used with the SLP valved Bilsteins from proper ride and handling, and will give a ride as good or better than stock with better handling than stock. Of course, most of that improvement is from the shocks, not the springs.