Will this diffuser scrape on steep inclines or driveways?

The diffuser extends beyond the bumper plane and sits lower, so approach angle matters. Check ground clearance on your driveway before installing. If ramps or steep angles are regular, account for the added projection when parking or approaching obstacles.

Does this diffuser produce functional downforce, or is it cosmetic?

This is a styling piece. Real downforce requires specific shape, angle, and speed thresholds—this diffuser adds visual aggression at the rear but should not be relied on for aerodynamic performance gains at street speeds.

What prep work is needed before painting?

Sand and prep the surface thoroughly before applying your chosen primer and topcoat. FRP panels benefit from proper surface etching to ensure paint adhesion. Follow your paint system's instructions for prep grit and primer type.