It’s time to kick off the 2019 Porsche GT3 Cup Challenge USA by Yokohama season! The Porsche one-make series makes a booming return this weekend to Barber Motorsports Park with a 30-car field, its largest since 2014. Both of the weekend’s two 45-minute races will be streamed live on IMSA.tv (Saturday at 5:30 p.m. ET, Sunday at 12:55 p.m. ET).