Porsche is constantly innovating ways to deliver a better sports car. The way it has developed its iconic 911 over the past 50 years is proof. But in this era of strict fuel emissions standards across the globe, all carmakers must devise ways to balance high performance and efficiency. It's not an easy task, but Porsche has proven that it's capable of solutions, such as the 918 Spyder. And now this spy video has surfaced showcasing what could be a 911 hybrid test mule on the Nurburgring.

How can we tell it's a potential hybrid? When you look through the windshield and into the back seat, there appears to be a battery pack. It also delivers a high-pitched noise as the car shifts and during acceleration, further suggesting a hybrid powerplant is doing the motivation.