TEST DRIVE: 2016 Porsche Cayman GT4. “We didn’t think Porsche would ever build this car. It’s a Cayman with the 911’s engine for base-911 money: $85,595. Many have heralded this as fratricide. But here’s why the Grand Cayman won’t kill the 911: Not many GT4s will be made, the GT4 is manual only, and 911s sell because they are 911s.”