Normal, day-to-day braking performance has little to do with your actual brakes, assuming they are in proper operating condition. Better braking performance comes from better tires, better grip.
Brembo PP/Track Pack cars have the larger/better Brembo brakes so they can go to the track and handle and dissipate the heat from repeated braking. On the street, it's not likely for you to work your brakes hard enough to need larger brakes like Brembos. Brembo PP/Track Pack cars brake well (on the street)because of their tires, not their brakes.
So, your first a foremost performance mod should be better tires (and most people get different wheels, but they're not necessary). This is where you will get your biggest bang for your buck improvement. Then, better suspension. The brakes, if you take your car to an actual track.
2012 GT Premium, Brembo PP, MT82, 3.73s, Blk/Blk. Bama 93R, Koni Yellow Rear Shocks, Hawk Ceramic pads, Luxurious & Plush Floor Mats