fwiw, the Pirelli World Challenge Z's that I saw down at Mid-Ohio in 2012 were running the factory sport calipers with 2 pc slotted rotors. I figure if factory size brakes are good enough for professional race cars they should be ok for you.
Brake items that should be upgraded though:
Pads
Fluid
Cooling
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'11 370Z Nismo #528 Fast Intentions | Stillen | Motordyne | Uprev | CSF | Zspeed | Z1 Motorsports | AST | Swift | SPC | SPL | Whiteline | Hotchkis | Bride | Schroth | Robispec | Cusco | Nismo | Volk | Forgestar | Hoosier | RJM
'17 Titan Bone Stock
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