Spotting the upcoming 2014 BMW M3 sedan at Nurburgring seems to become a routine these days. A new spy video gives us a look at an M3 prototype during a high-speed testing session at the famous race track.

The F80 BMW M3 drops the V8 naturally-aspirated engine in favor of a new 3.2 liter inline-six engine that sources say will develop around 450 horsepower. The new M3 is expected to be slightly faster than the current E90 generation thanks to a lower weight achieved by use of lightweight materials, such as aluminum and carbon fiber.

The engine is mated to a double-clutch transmission 7-speed transmission. The U.S. enthusiasts will most likely see a manual transmission option as well.

The new M3 will debut at the 2013 Frankfurt Auto Show with sales starting in early 2014.

Here is the car in action.