The newest version of Tein FLEX coilovers with the EDFC and with Umbrella auto designs VRH (Variable ride height suspension).
The variable ride height suspension is made by Umbrella Auto Designs here in America, and they are a pretty big company that makes these for NSXs and other high end sports cars. These are basically aluminum cups that can be filled with air in an instant to raise your car 2-3" to go over speed bumps etc. The nice thing about this is that unlike airbags and other adjustable height suspension, this does not affect handling of the car at all. When they are not filled with air, they are just a thin aluminum spacer.
-The EDFC for the coilovers allows you to also adjust the stiff ness of your coilovers from inside the cockpit of the car.
New the Tein FLEX is $1450 New the EDFC is $400 New the VRH is $3500
Total new is around $5400
All of these parts are brand new and never used with zero miles on them. I'll sell it all for $3500 shipped. It will come with all lines and everything needed to install all of this in your Z.