[gallery link="none" columns="1" size="full" ids="47052"] words: Bill, photos: Audi of America Our 2nd installment of #quarantinequattro comes from Audi of America. This very Audi Holiday (quattro de Mayo) celebrates 40 years of quattro. First up (and in our hearts) is the Audi Sport quattro S1. This car dominated rally racing so much, it changed it. quattro was declared an 'unfair advantage' when it was introduced into touring car racing. You can download it HERE. [gallery link="none" colum...