Will this scrape on steep driveways or inclines?

The diffuser extends below the factory bumper line. Test your vehicle's approach angle and clearance before committing to installation, especially if you frequently encounter steep driveway angles or speed bumps. Adjust your entry angle accordingly.

Do I need to drill into my bumper, or does it bolt to existing holes?

Reference your vehicle's OEM rear bumper mounting structure to determine attachment points. Most FRP diffusers align with factory fastener locations, but always verify hole placement and spacing on your specific bumper before assembly.

Is this functional downforce or cosmetic?

This is styling-focused. The diffuser improves visual aggression at the rear and may provide minor aerodynamic benefit at highway speeds, but it is not engineered as a high-downforce performance component. Install it for the look you want.