While was never officially released for the PS4, it can be played on jailbroken consoles by converting the original PS2 ISO into a PS4 fake package (fPKG) . For the best experience, users generally look for "Spec II" modded versions or specific NTSC configurations to optimize performance on the PS4's built-in emulator. Top Recommendations for GT4 on PS4 Gran Turismo 4 Spec II Mod
Searching for a Gran Turismo 4 PS4 PKG refers to finding a "fake PKG" (fPKG) file used to play the classic PlayStation 2 title on a jailbroken PS4 console via PS2-on-PS4 emulation The "Best" Version: GT4 Online Public Beta gran turismo 4 ps4 pkg best