We do know the spring rates. However, it would be misleading if we were to release the current rate when we have not fully decided on the final rates. In addition, We didn't simply to these springs to provide a nice drop but a feel that utilizes the full rebound and compression capabilities of the OEM shocks.
Its all in the quality of the springs.

 

Are you still offering the GT-F installation posted ?

 

Yes, when lowering 1.0" you'll need a rear camber kit, and aftermarket toe bolts to get alignment back into spec.

This link will answer all your questions and then some...https://my350z.com/forum/brakes-and-...ion-101-a.html