Audi RS6 4.2 Biturbo on our Dyno 2. March 2012 chrigi This week we had the honor to tune a customers Audi RS6 4.2 Biturbo! We fitted a Milltek Catback and Sharen with:Tweet Email a link to a friend (Opens in new window) Email Print (Opens in new window) Print More Share on WhatsApp (Opens in new window) WhatsApp Read More