If you go with super sports, you will want to have aftermarket shocks and struts and also cc plates at least. They drop the car a lot and you will have a poor ride quality and uneven tire wear without the additional parts and an alignment afterwards. As far as the bumpsteer goes, it will drive better with it, but you can probably get by without it. Before I did my suspension, I went through this thread
http://mustangforums.com/forum/4-6-m...uspension.html
and learned a whole lot. Read this post by oxford and then come back with any questions you still have.