Bullit Brake Kit

your not going to see a HUGE increase in stopping power! You basically already have the same calipers on your car now. You would be upsizing rotors and adding prolonged stopping power to your car, but as far as a 1 time stop i'd have to say the improvement would not be huge!
Unless you do alot of heavy spirited driving or track events then this is mostly a cosmetic upgrade for 99-04 gt's since your stock brakes are fairly good. Its us 94-98 gt's that really see a HUGE difference from the swap because our stock brakes were junk.
 
I just installed mach 1 brakes and MM stainless hoses last week and there is definitely a difference but it is not a huge difference. I would only suggest doing it when your stock brakes are pretty much gone. I bought the rotors and calipers from www.buyfordracing.com for $259, I ordered the mach 1 kit subtracting their brake lines and bought stainless brake hoses from MM. All finished it cost me less than 400$
 
i have the bullitts... pedal is firmer... stopping power is not very noticable... but it will be good for longevity, and i drive for my job.... so i liked em. not really worth the money unless you are driving all the damn time, or racing it (solo, road course)

Torinalth