I put the Steeda "Stop the Hop" pack on with the upper control arm for lowered vehicles at the same time of spring install. Did not need a Panhard bar.
I haven't had the car aligned yet. I put the parts on when the car only had 20 miles on it and at 6k I am noticing the insides of the front tires wearing a little more than normal, so I just rotated them. Other than that it's fine. I will probably get an alignment next spring when I get new tires.
How do you like the stop the hop pack? Do you go to to drap strip?