Will this diffuser scrape on steep driveway inclines?

Verify ground clearance at your vehicle's lowest rear point before installation. The diffuser extends the rear profile—measure your current ride height and compare it to typical incline angles you encounter. You may need to adjust approach angles accordingly or confirm fitment on your specific setup.

Is this functional downforce or purely cosmetic?

This is a styling piece. It replicates the visual design of the AF-1 diffuser profile. For aerodynamic function, consult the vehicle manufacturer's engineering specs or independent wind-tunnel data on this specific design.

What finish should I apply to protect the FRP?

Sand and prep the panel with appropriate surface treatment, then apply automotive-grade paint or clear coat of your choice. Clear coat is recommended to protect the finish from UV exposure and road debris. Follow your chosen product's application instructions for best results.