Will this diffuser scrape on steep driveways or inclines?

The Taveran profile extends lower than stock, so check your approach angle before installation. If you frequently navigate steep entries, test the fitment on your specific vehicle. Most owners find clearance acceptable on normal roads and moderate inclines.

Is this diffuser purely cosmetic, or does it serve a functional purpose?

This is primarily a styling piece—the Taveran design creates visual aggression and definition at the rear. Any aerodynamic effect at normal speeds is minimal. Install it for the look, not for measurable downforce.

What prep work does the FRP panel need before painting?

Sand the surface with appropriate grit to accept your chosen basecoat and clear coat. Ensure the panel is clean and dry before starting your finishing process. Follow your paint supplier's recommendations for adhesion and cure time.