[gallery columns="1" size="full" link="file" ids="87099"] If you've always wanted to own a works Group B spec Audi Sport quattro S1, this year's Goodwood Festival of Speed may be of interest to you. That's when chassis # SQ85EA905108, a former Hannu Mikkola / Arne Hertz example is headed to auction with Bonhams. Granted, a roadgoing Sport quattro will fetch over a half million dollars nowadays, so a factory prepared Group B racecar with a back story will go decidedly higher. Bonhams pre-sale e...