Just like the real thing I shortened the wheel base of my standard Quattro design, I'm nor sure exactly what one stud relates to, but it is certainly significant and faithfully replicates the real car's almost carton-like stance.
The model also showcases various features and techniques, including the wedge-shaped rear pillars, long nose and multitude of air intakes and cooling vents. Again, just like the real car it features white, multi-spoke wheels.
Instructions are for Red, but also build in White or Black.