Will this diffuser scrape on steep driveways or inclines?

The Junto style features a subtle lower extension. Check your vehicle's current ride height and driveway approach angles before installation. If you run lowered suspension, test clearance at your typical parking spots first.

Is this a functional diffuser or cosmetic?

This is styled as a Junto diffuser for visual definition. While the integrated elements suggest aerodynamic intent, this is primarily a styling piece. Real downforce requires engineering validation beyond aesthetics.

What prep work should I do before painting?

Sand the surface to proper smoothness, clean thoroughly to remove dust and oils, and apply your chosen epoxy primer and paint system. Follow your paint manufacturer's surface prep guidelines for best adhesion and finish.