I think Phil is running 18" or 19" rims to fit those monsters in.
I'm sticking with my 17" rims and have 328mm (13") rears with Hi-Spec 4 piston callipers. The fronts are 343mm (13.5") rotors with Hi-Spec 6 piston calipers.
The rears are on and I'm fabricating the brackets for the fronts. Initial checks show they will fit inside the 17" rims OK.
Cheers