Will this diffuser scrape on steep driveways or parking lot inclines?

Mara diffusers are designed to follow factory rear body contours, so ground clearance mirrors your stock setup. Monitor approach angles on aggressive ramps or off-angle parking — your vehicle's suspension geometry and ride height ultimately determine clearance, not the diffuser itself.

Is this functional downforce or purely cosmetic?

This is a styling diffuser that complements the rear appearance. It is not engineered as a high-downforce aero component. For airflow performance data, reference computational fluid dynamics (CFD) or wind tunnel documentation specific to this Mara design if available from the manufacturer.

What prep work is required before painting?

Sand the surface with appropriate media to ensure paint adhesion, then clean thoroughly to remove dust. Refer to your paint supplier's guidelines for primer selection and application. Proper surface prep is critical to a long-lasting finish.