I am running a 340 / 300 setup with the Ground Control / AGX now and it is not stiff enough...therefore, I thought I would go a little higher on the spring rates. I would call and ask Tein, but am not sure how to get in touch with them. Chris (TRI) has been trying to help me out in getting these, but like most people, has not seen a rate this high on an Impreza yet. If I hate it, can I switch the springs later like Bassem did? Any ideas on cost to do that? I am assuming that the dampers are the same for all the springs (which seems odd) so I shouldn't have a problem, right?