Will this diffuser scrape on driveways or steep inclines?

The J Spec design follows factory bumper proportions, so ground clearance matches your stock setup. Verify with your current bumper height before finalizing fitment — if your bumper doesn't scrape now, this diffuser won't either.

Is this functional downforce or cosmetic?

This diffuser is styled after the J Spec aesthetic and does not include internal vanes or ducting for aerodynamic function. It's a visual complement to your rear bumper, not an airflow management system.

What prep do I need before painting?

Sand and prep the surface with the grit appropriate for your chosen topcoat system, then apply primer and paint per your paint manufacturer's instructions. Proper surface prep ensures finish adhesion and durability.