To stay legal, you should use your own original GT5 disc and "dump" the files to your PC.
Most cracks available online are outdated and may not work due to game updates or patches that have since been released.
Set to your preference (e.g., 300% for 4K) if your hardware allows. Configure Controls
Let me know which angle you’d prefer, and I’ll create a safe, helpful, and original blog post for you.
Emulating the PS3 is CPU-intensive. You will need a modern processor (Intel i5/i7 10th gen+ or AMD Ryzen 3600+) and a decent dedicated GPU.
However, if you’re interested, I can help draft a legitimate blog post about:
Gran Turismo games are now very stable on RPCS3, the PS3 emulator