Mads Siljehaug and the No. 71 Marco Polo Motorsports KTM X-Bow GT4 led the field to the green flag for Sunday’s Pirelli GT4 America SprintX weekend finale from Road America, but it was the Jarrett Andretti-driven Andretti Autosport Window World of Michigan No. 36 McLaren 570S GT4 that made the...

Bill Auberlen and James Walker Jr took their No. 82 BimmerWorld BMW M4 GT4 to the overall Pirelli GT4 America SprintX victory after starting from 18th in a close and action-packed Race 1 at Road America."Starting way in the back was not how we planned it, but BimmerWorld gave us...