Thanks Guy's! I have personally tested all kinds of drop coil springs from Hotchkis, DSE, to cutting springs and along the way all kinds of regular gas shocks.... Then I talked Kyle of DSE into designing a G-Body suspension then that whole kit was tested on my car with drop springs and gas shocks, then I moved up to their coil overs. Then from their I installed the RideTech coil over suspension with the single adjustable coil overs and loved how it handled, very similar to the DSE suspension...This whole time testing each of these products on our white GNS test T-Type and autocrossing each change, weighing each change and logging each change in handling character differences. Installed and drove several RideTech Air suspensions as well.... With the air you have more versatility and adjustments cause essentially you have a coil over with an air bag wrapped around it and you can adjust everything. One nice thing air has over coil over is that you don't have to lay under the car to make your adjustments, you simply have 3 pre sets with your race setting, your handling setting, and one more if you like.... The best feature is that if you load your trunk up to go to a buick event for 4 days out of town and all that weight has your ass end of the car sagging, just touch the buttons and add Air! Can't do that with coil overs!