Figured I would put up some data for you guys to chew on here.
2012 SHO
Rotors: 325mm vented front, 330mm solid rear
Front caliper: 48mm x 2
Rear caliper: 45mm x 1
MC bore: 1.062"
2013 SHO
Rotors: 352 vented front, 345 vented rear
Front caliper: 48mm x 2
Rear calier: 45mm x 1
MC bore: 1.125
Clearly the rotor size is bumped up a bit on both ends. And a vented rear will aide in durability for sustained heat use as well.
Note however that the caliper piston size remains the same. Yet the MC bore is enlarged. That enlargement is your "better" that everyone is jumping up and down about. However that larger bore produces much less pressure than the smaller bore one found on the 2012. While your foot is telling your brain better the reality is that you are simply pushing harder on the pedal.
What I confess to not having run yet (you can do it) is the how the lower pressure combines with the larger diameter (radius really- not as impressive) between the two. I'm of quick thought process of saying that for the same given effort the new car has less brake torque in reality. That 1/16" of area pressure loss trumps the 12mm of rotor radius increase I bet.
Run the numbers
http://www.tceperformanceproducts.com/bias-calculator/ and see. Just keep all the data in MM if you want on both and only look at the rotor torque values. 325mm or 325 inches it's the same for comparing the changes.
Ran it quickly without converting it to inches. As expected the 'new' brakes actually make less total brake torque for the same given input pressure. To ramp them up to be "better" the amount of effort needs to go up also- that's the feel aspect. Interesting to note the car is a bit more front biased this way also.
I agree on the booster but that would go to further my point; the changes are not really more brake torque so much as it is a mental thing that makes folks think they are better. The consumer wants tactical feel really more than he does torque. Modulation is key and a softer pedal is much harder to do that with. The 'new' set up doesn't really brake any better (worse really) but the pedal gives the impression they do because that consumer has to work harder. Not overly surprised at any of that and I wouldn't loose sleep over it but it was worth looking at.
