Porsche Endurance Challenge North America: Invitational

The Porsche Endurance Challenge North America is a multi-class endurance series for Porsche GT3 Cup cars and Cayman GT4 models, with drivers rotating during races. The field divides into professional and amateur classes by driver standing; the GT3 Cup Pro-Am class sits strongest and combines full professionals with Silver-graded drivers, while the GT3 Cup and Cayman amateur classes draw primarily Bronze-graded competitors. Blake McDonald, Trenton Estep and Riley Dickinson lead the current roster. Drivers arrive chiefly from IMSA Pilot Challenge, which runs a comparable field, and from club racing through NASA and PCA; the series sits between those entry-level categories and the top-tier IMSA WeatherTech Championship, toward which its strongest drivers progress. Movement to GT World Challenge America runs parallel.