The new lightweight Boxster was just unveiled a few weeks back at the 2015 New York Auto Show, showing a 3.8-liter flat-six, just like the Cayman GT4. It's without a number of GT4-specific components, though.
According to Autocar, a Boxster Spyder GT4, if it were built, would benefit from the same 911 GT3-inspired adjustable front suspension, a unique rear suspension, GT3-spec brakes and a new aerodynamic kit.
"We are looking at it right now," a source within Porsche told Autocar. "Much of the engineering has already been done for the Cayman, so we think this might be a good direction for us."