For anyone that owns a pre 05 car and cares about handling, this is a key mod and especially for the price. On the 05/06 it still makes a noticeable difference, but not as critial.

Also, since someone mentioned the cross member lock, I have talked to several people about this that say it is really only noticeable after you have replaced all the rear links. Before that, the link bushings move to much to notice the smaller difference the cross member lock does. However, the cross member lock is just so cheap and easy.