Will this diffuser scrape on ramps or steep driveways?

The diffuser extends below the bumper line and will make contact on steep inclines or aggressive approach angles. Verify ground clearance on your typical routes and driveway geometry before final installation. You may want to test fit with jack stands at ride height.

Is this diffuser functional or cosmetic?

This is a styling component that follows the Versus design language. While diffuser geometry can aid flow separation at speed, primary value is visual — it's designed to look aggressive and integrated with the rear bumper, not to produce measurable downforce or aerodynamic gain on street driving.

What's the best way to prep and finish the FRP before installation?

Sand the surface with appropriate grit to key the finish, then wipe clean. Apply your chosen primer and topcoat per the paint manufacturer's specs. Curing time varies by product — allow full cure before exposing the diffuser to weather or car washes.