The original Horizon tool was a legendary piece of software for Xbox 360 modding. While it is largely obsolete for modern Forza Horizon titles (FH4 and FH5), many of its core concepts, like "rehash and resign" (repairing a save file's digital signature), are still the foundation of modern save editing.
Severe or repeat offenses can lead to your entire Xbox Live account or PC hardware being blacklisted from all Forza titles. 2. Complete Save Corruption
This is where bans happen. Advanced users can edit engine swaps, tire compounds, and weight values beyond the game's legal slider limits. This creates "grip builds" that corner at 300mph, or "drag builds" that accelerate faster than physics allows. If you take a car modified beyond game limits into a online race, the server will flag you.
Populate the leaderboards with custom top speeds and perfect scores. Step-by-Step: How Save Editing Works