Next Porsche GT3 to get the upgraded 4.0-liter from the 911 Speedster

Porsche is playing back-and-forth with its naturally-aspirated 4.0-liter flat-six. Engineers in Weissach overhauled the motor to comply with incoming European regulations, and added more power before slotting it into the new, 502-hp 911 Speedster. Andreas Preuninger heads Porsche's GT division, and has said in the past that he wants to power the GT cars with naturally aspirated engines for as long as possible.