Currently I have Ground Controle coil overs with KYB AGXes, after ridding in my GFs car with regular lowering spings(rides alot better), in thinking about selling my coil overs and getting regular springs. What do you guy think would be a good replacement? I want the highest performing spring possible.

 

The highest performance would be to call GC up and order a set of softer springs so that you can still use your Coilovers and then when you want to run at an Auto-X or Road course you can change your springs out.