Having set the fastest lap at the Nurburgring ever recorded by a production car, the Porsche 911 GT2 RS is well established as a highly capable sports car. However, a hardcore, track-only version could be on the horizon. Porsche was recently spotted testing several protoype models at the Monza race circuit in Italy, including a new 718 Cayman GT4 race car, an updated 911 GT3 R for races such as the Bathurst 12 Hour, and the latest 911 RSR which will battle against Ford, Ferrari and Aston Martin at the 24 Hours of Le Mans.

One of the cars, captured by YouTube channel 19Bozzy92, appears to be a modified GT2 RS sporting additional air vents, a more aggressive rear wing from the 911 GT3 Cup car, and center-mounted exhausts instead of the edges like the standard road car. It's possible then, Porsche is preparing a new race car based on the GT2 RS.

Alternatively, it could be a more hardcore, track-only version of the GT2 RS to take on the likes of the McLaren Senna GTR and Ferrari FXX K. The engine note certainly sounds like the road car's 3.8-liter twin-turbo unit, and the bodywork doesn't look extreme enough to be a thoroughbred racer. Plus, Porsche already has a plethora of 911 race cars. Hopefully we'll learn more about Porsche's new track toy at this year's Goodwood Festival of Speed, which is celebrating the German automaker's 70th anniversary. A hardcore, track-only version of the most powerful 911 ever made would be the ultimate swan song to the 991 generation, before the new 992-generation model is unleashed next year.