Will this diffuser scrape on steep driveways or inclines?

The Rega diffuser adds a lower profile to the rear bumper area. Check ground clearance against your vehicle's current ride height and any suspension modifications before installation. If you run lowered springs or air suspension, verify minimum tip clearance on your typical routes.

Is this purely cosmetic, or does it serve an aerodynamic function?

The Rega diffuser is styled to the Rega spec and integrates with the rear bumper line as a visual enhancement. Whether it generates functional downforce depends on your vehicle's overall aerodynamic package and speed range. For track use, consult with your tuning shop on complementary aero components.

What prep and paint process should I use?

Sand and prep the surface with standard automotive sandpaper before applying your chosen finish. Use quality automotive primer and topcoat products rated for plastic substrates. If sending to a shop, provide the raw FRP panel directly — no additional media blasting needed.