Will this diffuser clear the ground on ramps and steep inclines?

The diffuser sits low on the bumper and will scrape on severe approach angles or loading dock ramps. Test fitment on your typical driving surfaces—parking lot ramps are usually safe, but driveways with sharp inclines or speed bumps may catch it. Drive defensively in low-clearance situations.

Does this add functional downforce or is it purely cosmetic?

This is a styling piece. The L Sport profile creates visual aggression and frames the lower bumper, but it does not produce measurable aerodynamic downforce at street speeds. Install it for the look, not for performance gains.

What prep work is needed before painting?

Sand the surface with fine-grit abrasive to scuff the finish, then wipe clean of dust before applying your chosen primer and paint system. Follow your paint supplier's surface prep guidelines for best adhesion and durability.