What is the height change with GC's
 

From which height to which height do the GC's allow you to change the height of the protege (lol gotta love that english)

Well with the 3rd gen's they seem to go pretty low with the GC coils , If you figure they can most likely take all the wheal gap out of your well ,, when I had mine on virtually all the wheal gap was gone ,, and you know the second gen sits pretty high stock ,.
You can also raise the car back up also , I don't really know how close to stock it will be but it should be pretty close
Bruc e

I believe GC's where originally about 2" to 3.5" drop. But, from what I last heard, they are putting taller springs in all the newer sets which sets almost stock in the highest setting & down to about 2.5" in the lowest. Pretty nice. But, you can ask for a shorter spring if you want the 2 - 3.5" drop instead of the 0-2.5" drop. I know the first set of these I sold where the lower drop because people where saying in its highest setting, it almost chopped the wheels.