Sorry guys; I guess my question wasn't clear to everyone. I'm well aware that when you go to a bigger rotor size, you'd need the larger caliper mounting bracket as well as the GT's calipers (and a larger wheel size for clearance) to move the calipers out far enough to accommodate the larger disc. However, elsewhere I was told the GT's calipers are bolt-ons that fit the stock V-6 caliper bracket and can be used with with the OEM size rotor (I believe it's 11.5" for the V-6 automatic). To add to the confusion, I saw one posting that said the OEM rotors for an automatic V-6 are slightly larger diameter than the ones used for the V-6 manual trans. So I'm wading through some conflicting versions about whether or not I can simply replace my V-6s floating calipers with a better caliper from the GT. Are there no calipers (Brembo, Wilwood, etc) that can be used with the V-6 stock rotors or would my only option be to go with a Big Brake kit, with the additional cost of a larger wheel/tire combination? Other than for looks, moving to a big brake kit has already been shown to have a negligible difference in braking capabilities and stopping distances...