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

The diffuser extends below the bumper line by design. Check your approach angle when loaded and test your typical driveways before committing to permanent mounting. Consider your suspension setup and ride height when evaluating clearance on your specific vehicle.

Is this functional downforce or purely cosmetic?

This is a styling piece that follows GMR aesthetic lines. It's designed for appearance and visual flow rather than aerodynamic performance. Functional diffusers require precise ducting and depth; this panel delivers the look without that complexity.

Do I need to modify this for my 2+2 model, or is it plug-and-play for coupes?

This diffuser is engineered for coupe models. The 2+2 chassis has a different rear overhang and bumper geometry, so modifications to mounting points and fitment will be necessary. Verify your vehicle's configuration against the coupe spec before ordering.