Will this scrape on steep driveways or over inclines?

The AM Design diffuser is profiled to fit within standard rear bumper clearance. Verify ground clearance on your specific setup by comparing the diffuser geometry to your vehicle's current ride height and driveway approach angles before installation.

Is this functional downforce or purely cosmetic?

This diffuser adds visual aggression and aerodynamic character to the rear end. For measurable downforce contribution, it works best as part of a complete aero package; as a standalone piece, the aerodynamic gain is modest and primarily visual.

What finish prep should I do before installing?

The diffuser ships brand new and ready to install. If you plan to paint or apply a protective finish, sand the surface lightly and prep according to your chosen coating. A UV-protective clear coat is recommended to preserve the carbon weave and protect against UV degradation over time.