Will this diffuser scrape on steep driveways or inclines?

The diffuser sits below the rear bumper line, so ground clearance depends on your vehicle's existing ride height and suspension setup. Before installation, measure the lowest point of your bumper to the ground and verify clearance matches your typical driving angles — driveways, parking lot approaches, and highway on-ramps. If you run lowered suspension, test fit at your vehicle's actual height.

What prep work do I need before painting?

Sand the surface with appropriate grit to establish paint adhesion, then wipe clean of dust. Apply your chosen primer and basecoat per the paint manufacturer's instructions. FRP can accept standard automotive urethane and acrylic paints — confirm compatibility with your paint supplier before application.

Is this diffuser functional or cosmetic?

The TS-1 design provides modest aerodynamic benefit at highway speeds by helping direct underbody airflow, but its primary purpose is visual — it adds aggressive lower styling to the rear end. It is not a high-downforce track component; if maximum aerodynamic performance is your goal, factor that into your expectations.