ADVANCE AUTO PARTS SPORTSCAR SHOWDOWN MAY 5-6TH, AUSTIN TEXASPhotos by Bridget Daehler After sharing the stage with the World Endurance Championship at Lone Star Le Mans, the IMSA WeatherTech SportsCar Championship headed out on its own for an action-packed celebration of speed at the Advance Auto Parts Sportscar Showdown happening at Circuit of The Americas May 5th and 6th for