BMW has released a new promotional video for the M4 GTS Concept.

BMW has released a new promotional video for the M4 GTS concept.

Recently unveiled at the Pebble Beach Concours d’Elegance, the M4 GTS concept is a high-performance coupe that previews an upcoming production.

BMW has been tight-lipped about performance specifications but they confirmed the concept has a 3.0-liter TwinPower Turbo six-cylinder engine with a water injection system that increases both power and torque. As the company explained, "The water is injected into the plenums of the intake manifold as a fine spray. When the water vaporizes, the intake air cools significantly. As a result, the final compression temperature in the combustion chamber – and therefore the engine’s tendency to 'knock' – is reduced, enabling the turbocharged engine to use higher boost pressure and earlier injection timing."

Besides the upgraded engine, the concept has a carbon-fiber reinforced plastic hood and modified front fascia with larger air intakes.  There's also a carbon fiber front splitter, a carbon fiber rear wing, OLED taillights and 19- / 20-inch lightweight forged alloy wheels.

Gallery: BMW showcases the M4 GTS concept [video]