[Gabriel]

I don't think the size of the rotor is to blame . If you go for bigger rotors , then you have to change the calipers , in other words the whole nine yards...Now there's another thing , I have a Focus SVT , pretty much stock , except for the intake and new ECU program . But if your car it's a ZX3 to begin with , then your front rotors are smaller and that could be an issue . Also if you had modified it and boosted the power big time then you could be able to launch it harder than me so you'll need more stopping power , which to original ZX3 setup might not be able to handle . But if you ask me , I would just start with installing some good ceramic pads and see how it goes , or if it's in your budget , try Focus SVT rotors and calipers . If you go Brembo , those are over 2 G's