i have pro kits and kyb agx on a 5th gen. No, its not your shocks, its definitely the springs. The ones in the rear have a certain part of the spring that are dead coils. So they clank when they hit a bump. Mine do that as well. Call Eibach up and tell them and they'll send you some tubing that you can slide up along the springs. I have the tubing but got too lazy to put it on....so i just live with the clank....i bear with it.