Another advanced technology appearing on the M4 GTS are OLEDs (organic light-emitting diode), in this case used in the tail lights. The special LED's low installation height of just 1.4 millimeters, and the ability to actuate individual light modules that emit light to a single point, allow designers to be much more creative when designing light clusters. Multi-element lighting, layering, three-dimensional effects, and a wide variety of vivid colors—constrained by safety regulations, of course—are all possible.
Beyond these technologies, the M4 GTS also benefits from significant weight-saving measures. The end result is a 3,329-lb curb weight. This was achieved by replacing many of the standard M4’s steel components with lightweight carbon fiber-reinforced plastic pieces, such as the hood, roof and trunk lid plus hidden components such as the instrument panel support and driveshaft. Additional weight was reduced through the use of lightweight forged wheels, carbon-ceramic rotors and a rear seat delete option.
When it comes to handling, the M engineers have installed a fully functional aero kit, most of which is composed of carbon fiber. There is also a lightweight suspension setup composed of forged aluminum. It features a racing-derived rigid connection between the rear axle subframe and the body as well as three-way adjustable coilovers with mechanically adjustable compression and rebound settings. Moreover, the anti-roll bars and support mounts are closely matched to the significantly increased engine power of this model.
Other features helping to add an extra edge to the driving dynamics include the rear differential’s hollow lightweight output shafts and the Active M Differential. The latter uses an electronically controlled multi-plate limited-slip differential that reacts with split-second speed to vary the locking action, which can be anywhere between zero and 100 percent. The steering system has also been adapted to suit the car’s track-focused nature.
For the interior, the M4 GTS has been fitted with unique bucket-style M sports seats in Alcantara (including lightweight backrests with cut-outs). In between the seats, the BMW M4 GTS boasts a new, asymmetrically styled lightweight center console that shaves around 30 percent off the weight of the corresponding component in the regular M4. A roll cage and fire extinguisher have also been added to the car.
The world debut of the BMW M4 GTS will take place at the 2015 Tokyo Motor Show later this month. BMW plans to build just 700 examples in total. Of these, 300 have been earmarked for the U.S. For more from the Tokyo Motor Show, head to our dedicated hub.