The 1991 Audi Quattro Spyder was a groundbreaking mid-engined sports car concept unveiled at the Frankfurt Motor Show, featuring an aluminum body, permanent all-wheel drive, and a V6 engine.

It featured an innovative lightweight aluminum body, emphasizing a focus on reducing weight for better performance.

The concept was designed with a mid-mounted engine paired with Audi's signature quattro permanent all-wheel-drive system.

Despite being a show car rather than a mass-production vehicle, the Quattro Spyder was a significant study in advanced materials and driving technology for Audi.

It was originally intended to be built as a production vehicle, but that plan did not come to fruition.

Though intended for production, it remained a one-off prototype that heavily influenced Audi's future design language, technology, and performance direction.