Red Bull S1 Posted by RawCarCom on 03.10.2016 Posted in: Events, Events 2016, One photo post. Tagged: 2016, audi, audi motorsport, audi s1, audi sport, championship, mattias ekström, quattro, rx, world rx. The car of Mattias Ekström, leader of World RX Championship 2016 — 2016 Audi S1 Quattro, photographed on Bikernieki track this weekend.