Will this diffuser scrape on steep driveways or inclines?

The AF-1 profile is designed to follow the OEM rear bumper line and sits at the lower edge of the fascia. Verify clearance on your steepest entry angle before final mounting. Most standard parking geometry will clear without issue; aggressive approach angles or lowering setups may require fitment confirmation.

Does this provide functional downforce or is it cosmetic?

The AF-1 diffuser is styled for visual impact and lower-rear definition. While the sculpted shape complements aerodynamic design language, actual downforce contribution is minimal at street speeds. It performs best as a styling element that enhances overall rear-end proportion and flow.

What surface prep is needed before painting?

Sand the panel thoroughly to promote paint adhesion and ensure a smooth, even finish. Apply your chosen primer and topcoat system following the paint manufacturer's instructions. A clear coat is recommended to protect the finish and UV stability over time.