Audi R18 Ultra a quattro all-wheel drive prototype Brand Audi Audi will be using the second FIA World Endurance Championship (WEC) round at Spa-Francorchamps on May 5 as a “dress rehearsal” for the Le Mans 24 Hours as well. For the first time, two new vehicle models have to prove their viability on one of... By spare-wheel, 4 May, 2012