Look for the Veyron underneath the Chiron in Bugatti’s promo
How can you make a promo for a car that's still in pre-production and is not available for shooting? You'd think that special effects can solve this problem by designing the car from scratch, but it's harder than that: obtaining a realistic supercar driving over a real-life track requires a mule on which to map the digital car.
So Bugatti used a mule, and a very expensive one for that matter: they filmed a Veyron doing all the tricks on the track, then mapped Chiron's design over it and made it look like the real-life rocket it actually is.
See how the magic works, below. Now, does anybody know what expensive mule sits underneath my VW Passat?