Big Brakes Issues
Putting larger brakes on your car may not give you the results that you are looking for - ie - better stopping distance. Unless you use your car on the track extensively, larger brakes for street use is not necessarily the way to go. I have Wilwood 13" slotted and vaned rotors mated to 6 piston calipers on all for corners, ONCE they get up to tempature - typically 2-3 of laps - they have phenomenal fade free stopping power. On the street, they are terrible; very heavy and no feel at the limit, lock up, etc.. For me it is not an issue since I rarely drive the car on the street other than FCA events.
Listen to the words of wisdom from the prior posts, bleed the brakes, get ss lines, and more agressive pad compounds. If you experience fading, explore air ducts. If that doesn't work, then look at the bigger brake option but be prepared for the occasional scare when they are cold!
If it is for looks..well disregard my above comments
franck