Will the diffuser scrape on steep driveways or inclines?

The Unplugged profile sits close to the factory rear line, minimizing overhang. Test fit before final install to confirm clearance on your specific driveway approach angle — some E30s sit lower than others depending on suspension setup.

Does this provide functional downforce or is it purely cosmetic?

This is a styling diffuser designed to enhance the rear visual appearance. For measurable aerodynamic effect at street speeds, expect minimal impact — the value is aesthetic alignment with the Unplugged design language.

What prep is needed before painting?

Sand and prep the surface with standard automotive technique before applying your chosen finish. Once cured, the diffuser can be installed. Reference your vehicle's factory rear panel attachment points to ensure proper hardware placement during fitment.