source: Audi of America Audi Sport customer racing to compete in the 2018 Pirelli World Challenge with nine entrees representing all three classes Largest number of PWC entrees in brand history Audi Sport customer racing continues expansion of globally homologated, stair-step customer racing offering in TCR, GT4 and GT3 classes Herndon - Audi of America announces a two-class offering for the Pirelli World Challenge (PWC) season opener at the Grand Prix of St. Petersburg, Mar...