You need to understand the consequences. Polyphony Digital (PD) has a strict "Live Service" anti-cheat system.
Restore every car in your garage to 0 miles. This is purely cosmetic, but for collectors who want a "museum" garage, it is the most satisfying feature. save wizard gran turismo 7
Save Wizard is not the only game in town, but it is the most reliable for GT7. You need to understand the consequences