I always loved the HKS Kansai Service look, never over the top, subtle and under-stated. And the award for the most modified GT-R goes to...
HKS: Super Hybrid Filter, Premium Suction Kit, Super Sequential Valve Kit, High flow cat, Kansai Service Dual Ti-Muffler, High flow fuel pump, High power actuator, Kansai Service Sequential AT cooler, HKS EVC VI, ATSC (Active Torque Split Computer), Kansai Sports ECM, Kansai Sports TCM (traction control module), HKS large capacity AT pan, NEKO Corp height adjustable suspension, Kansai Service carbon Brake rotors w/Endless 6-pots, Recaro HTR Sportster.
Exterior: Kanasai Service (All carbon) grill, canards, front lip, brake duct, side skirts, rear diffuser, rear bumper heat insulator, rear wing, and lastly a top secret carbon hood.
Round things: F10J & R11J Yokohama Advan GTs w/Dunlop SP Sport F255/40RF/20 R285/35RF20 tires.
Phew... that was a mouthfull.