With OE calipers the maximum front rotor you can install is 395mm w/o modification, which gives you a minimum clearance of about 1.5 to 2mm top rotor edge to the caliper. Any size larger than 395mm you must enlarge the caliper curvature by grinding off the caliper as shown in hatch area to avoid interference.Time will show whether these are nice.
405mm PFC front.
390mm Racing Brake rear.
Time to test the ability to control the GTR in motion at speed!