Porsche opened the North American International Auto Show today with the World Premiere of the Porsche 918 RSR. Commenting on the first appearance of the sports car manufacturer from Stuttgart at the Detroit show since 2007, Matthias Mueller, President and CEO of Porsche AG said: "We are back in Detroit with a clear message: Porsche further extends its competencies when it comes to performance and efficiency. The Porsche 918 RSR impressively demonstrates the passion of our engineers and designers for developing the world's most advanced and best looking sports cars."