Actually, it's not that different. Maybe the spring and dampening rates are different, but the suspension swap is not that big a deal. My GS has ITR springs, shocks/struts, lower control arms and an ITR rear swaybar. The swaybar is the only part that required much custom work to use (BEAKS kit). To use ITR rear struts I had to swap out my GS LCA's for ITR LCA's. The swap lowered my car very slightly and gave it a much firmer ride.

JD