4.0-liter six-cylinder horizontally opposed and naturally aspirated engine derived from the 911 GT3 Cup offering 368 kW (500 hp), 460 Nm and a high-revving concept 
Link: http://www.porsche.com/usa/models/911/911-gt3-models/
Link: http://www.porsche.com/usa/models/911/911-gt3-models/
