On a May day in 2020, a nondescript sedan set out from the Red Ball Garage in Manhattan, its driver determined to take back a piece of history. Departing shortly before 6 p.m., the silver Audi S6 should have encountered rush hour—but the world had closed down due to COVID-19. The sedan hit one stoplight on East 31st Street and was through the Lincoln Tunnel into New Jersey in six minutes, the start of a daylong, cross-country odyssey. Drivers Arne Toman and Doug Tabbutt were out to reclaim the Cannonball…