Will this scrape on driveways or steep inclines?

Rear diffusers sit low and close to the bumper line. Verify ground clearance at your vehicle's rear suspension geometry—check the lowest point of your current bumper on a typical driveway incline before installation to confirm adequate clearance.

Does this diffuser produce actual downforce or is it cosmetic?

This is a styling piece designed for visual impact. Functional aerodynamic benefit depends on overall rear-end design, vehicle speed, and airflow dynamics. Install it for the look—any performance gains are secondary to the design aesthetic.

What prep work is needed before I paint or finish this?

Sand and prep the surface with standard automotive finishing steps before applying your chosen primer, base coat, or clear finish. Follow your paint manufacturer's surface prep guidelines for adhesion and durability.