It is hard to come up with the perfect setup, since it does not exist. That is why it is so important to think about how you will be using the Mustang. A much stiffer suspension on rough roads is no fun. Too soft can be hairy on corners. Right now, I am looking at something like the Steeda/Koni set above, with Whiteline panhard bar and LCAs, GT500 strut kit. I am also looking at the Whiteline sway bars. With all the products and ability to tweak adjustments, it is a challenge to get right, but take it one step at a time. After each mod, evaluate the change, then make any adjustments needed. There can be occasion when you find a product is not suited for your needs. Then you have to step back and decide whether you can adjust it right, or get a more suitable replacement.