2016 Audi S8 Plus Unveiled with 605-HP Bi-Turbo V8 By Jodi Lai Sep 15 2015 Share this Article Tweet Audi has added another turbo to the S8’s 4.0L TFSI V8 engine Continue Reading... Filed under: Audi Featured Articles German Luxury Cars SedansTags: 2015 frankfurt motor show, 2016 Audi S8, audi s8