[gallery link="none" columns="1" size="full" ids="74908"] source: Audi of America Audi sphere concept cars, the skysphere, grandsphere, and urbansphere, will showcase Audi’s vision of the future of premium electric mobility at the Quail North American debut of the all-electric, one-of-a-kind Audi S1 e-tron quattro Hoonitron, inspired by historic Audi Sport quattro S1 “Pikes Peak”, will electrify enthusiasts at the Rolex Monterey Motorsports Reunion at Laguna Seca Audi grandsphere will be ...