It is a more aggressive ride. You can definitely take turns harder which is a lot of fun. I wish I knew technically how much lower the car is...H&R has their statement, but I would guess 1.5 inches.
If the springs haven't been sold yet, do you know if they will fit on a base 986? I might be interested. If your location is Atherton Ca (not sure if there is another Atherton), I can pick them up because I'm not too far from you.