A great start is to get the front SVT kit= 300mm rotors/bigger calipers. You can use your stock brake lines, but I'd get a set of SS lines. You'll need either svt spindles or '05 only spindles & the '05 ball joints to go w/ the '05 spindles. For rear disc's, '05-'07 ST rear disc are easier to get, then the svt ones. Like elsolo mentioned to convert to a abs system, you'll need a parts car.
Introduce Mr. Torsen to the mix
Bigger brakes then you- D23 crew- D-Tech- Sedan Revolution= #131