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For what you want to spend ($500) there are not a lot of options other that just up gradeing your pads and maybe putting on slotted crossdrilled rotors. If you want to upgrade your calipers you are going to have to spend a bit more. Here is a link to the full cobra brake up-grade that includes everything that you need. http://www.stangsuspension.com/store...?idproduct=446 this is your best option to up-grade your complete brake system.