As you might imagine for a car capable of 400 km/h, the Veyron Targa will need some beefing up when it loses its roof. Windshield pillars, as well as the chassis will need some additional strengthening. To compensate for that extra weight, Bugatti will most likely use carbon fiber to build the doors and hood. A freshening of the grille and the headlights is also expected. Those lights, btw, will now be doing a Lexus, and turning with the front wheels. The other major change is that the Veyron Targa's top speed will be reduced to a mere 217 mph.