The answer to this really lies in what you use your Mustang for, and how you drive it. If it is a street car with the occasional high-speed blast on the highway, the K-H disc binders will work perfect. The only time the oversized brakes pay for thier price and compromises is when you need much more brake capacity in a racing, autocross, or high-speed application.
Are you on a budget, or have you recently scammed the stock market with all of Greece's money, and that's not a factor? (current economy joke only!
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As well, converting to these larger aftermarket systems will most probably require a change in wheels, including larger rim diameters,
suspension pieces, master cylinder change, plumbing, and much more to your brake system than just bolting on new calipers for the look. Plan on spending easilly 4-8 times the money when you are done with an aftermarket system.
Best advice I can give in your situation is to make sure your system is in proper working order, you have in good brake fluid (DOT-4, NOT 5). There are more aggressive pads available, and they can slightly increase your stopping capacity. Slotted rotors are neat to look at, but thier ability to increase brake force is debated. they are designed to help cool the brakes after ahrd braking, but also will lead to rotor cracking and a short life. Stock rotors are amazingly durable when treated right. As well, how are your tires? If your brakes are so good, you can lock them up quick and just skid for miles, then what good are they?
Just some food for thought!
So, take a hard look at what you need for brakes, and how much you want to change before picking up that wrench.
The article I am working on hopes to cover this exact aspect.
Dan
BTW - On my racing Factory Five Cobra, I am still running a stock type single-piston caliper with very aggressive HAWK racing pads, and have them ducted for cooling air right into the rotor hat from the front of the car's grille. It does stop! No fancy-schmancy brakes there, just a well integrated system.