Were an Eibach dealer at Xtreme and we have many happy cutomers(myself included) with the Sportline series.That and some sticky rubber will help you not only go down a 1/4 faster but you pray for twisty 2 lane highways these 2 mods will out do a Z06 by far in the handling Dept.(UNREAL),Good Luck David Smilovic.
I have the steeda sport springs but I think they are too low. They must have sent me the wrong ones cause my tires rub on the wheel wells. When I go over a bump omfg the tires hit the tops of my wheel wells. I called and they said I needed the air shocks to change the ride height.