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Only one thing??? what about steel braided lines, better pads, or a slightly larger master cylinder??? there is a lot you can do to improve stock braking performance not all aftermarket kits live up to there billing but some do.[/b]
None of those things will shorten stopping distance. Steel braided lines might make the pedal feel firmer, and will definitely protect your brake lines from off-track events (touring the tulips). Better pads will not reduce stopping distance, they will improve feel at typical racing temperatures. Master cylinder changes only change the feel of the brakes, but they can't possibly change stopping distance. Even 14" rotors don't change stopping distance (but they certainly upset a well calibrated suspension by dramatically increasing unsprung weight).
There is only one thing that will improve your stopping distance: better tires. No matter how you improve your ability to control wheel speed (what a braking system does), it is completely at the mercy of the rubber to road interface. Too much braking force and the ABS kicks in or the wheel locks.
There are only two reasons to put big brakes on a car:
1. You drive on track days and you are cooking your brakes even with ducting installed.
2. You want to look cool by spending a couple-three grand on a brake system that does not change the actual braking performance of your car one whit.