Will this diffuser scrape on steep inclines or driveway aprons?

The diffuser mounts to your factory rear bumper, so clearance matches your current setup. Verify your vehicle's existing ride height and approach angles before installation if you've lowered your suspension.

Is this functional or purely cosmetic?

This is a visual styling piece that complements the M Sport rear bumper design. It does not generate aerodynamic downforce — treat it as a performance aesthetic that enhances the diffuser line of your bumper.

What finish should I apply, and do I need to clear coat it?

Carbon fiber is best preserved with a UV-protective clear coat to maintain gloss and prevent oxidation over time. Sand the surface lightly before your chosen finish and follow your paint supplier's prep guidelines for adhesion.