Will this diffuser scrape on driveways or steep inclines?

The AF-1 is profiled to sit within the factory bumper's footprint. Verify ground clearance on your specific vehicle setup before driving at extreme approach angles. Stock suspension typically clears without issue.

Does this diffuser provide functional downforce or is it cosmetic?

The AF-1 is engineered as an aerodynamic component that conditions rear airflow and complements the factory aero package. Measurable downforce benefit depends on vehicle speed and overall aero configuration. It is not a standalone performance mod.

What prep does the FRP panel need before installation?

Sand and prep the surface before applying your chosen finish. FRP requires a smooth base for paint adhesion. Clear coat is recommended to protect against UV exposure and maintain finish clarity over time.