The high-revving GT4 model is a standout, featuring a naturally aspirated 4.0-liter flat-six derived from the GT3.

Here's what to know about the GT4 America Lonestar Enduro race at COTA. An enduro race is an endurance race, typically ran into the night. For example, the Rolex 24 at Daytona and the Le Mans 24 ...