Maxton Design's gloss black rear diffuser for the BMW G29 Z4 M40i LCI Roadster gives the car's rear end a more muscular and aggressive look. The angular design transforms the rear bumper and makes the facelift Z4 M40i look more performance-oriented. This piece was designed using 3D scanning technology to ensure a perfect fit. The premium gloss black finish is very sleek and the lacquer is highly resistant to corrosion for long-term style.