Will this diffuser scrape on driveways or inclines?

Diffusers mount flush to the rear bumper and add minimal extension. As long as your vehicle clears the factory bumper on dips and ramps, this panel will clear as well. Check ground clearance on your typical driving routes before installation.

Is this purely cosmetic or does it serve a functional purpose?

This is a style piece—it's designed for visual aggression rather than aerodynamic function. The Kora design mimics a diffuser profile to enhance the rear stance without requiring complex underbody airflow management.

What prep work do I need before painting?

Sand the surface with appropriate automotive-grade sandpaper and wipe clean with a tack cloth before applying your basecoat and clear. Follow your paint manufacturer's instructions for primer adhesion and cure times between coats.