As this quattro Redux series has traced—from the featherweight A5 prototype in Part 1, to the wolf-in-sheep’s-clothing 2.5 TFSI mule in Part 2 and Part 3, to the origin tale and Malibu drive of the 2010 quattro concept in Part 4 and Part 5—it becomes clear just how deeply Audi experimented with lightweight design in the late 2000s. Yet one of the most intriguing objects from that era never reached a start platform, a dyno pull, or even daylight outside … Continue reading quattro Redux, Part 6: The Rally-Spec quattro Concept Racecar Proposal