To achieve a "Save Wizard" effect for , such as adding custom text or logos to your cars, you must use the game's Decal Uploader . Since GT7 saves progress to an online server , traditional "Save Wizard" cheating software (which modifies local save files) is generally not compatible with this title. How to Create & Upload Custom Text Decals
What it might do (and this changes with every patch) is allow for —specifically, modding a car you already own. Think instant engine swaps, maximum tuning parts, or changing a Civic’s horsepower to 10,000.