I just had a question about the eibach pro-kit or any lowering spring kit. Would I have to change any suspension parts(con. arms, panhard bar,etc.) when lowering my car (99ss) with the pro-kit or will it be fine just swaping in the springs? Any help is appreciated. Thanks.

 

You will probably need Lower control arm relocation brackets on the rear to keep the LCA's horizontal with the ground. Then you will need a front end alignment. Most people haven't needed an adjustable Panhard rod to recenter the rear unless you are running wider tires, but it's an option.