BMW has produced some very special models of the M3 sports car in the past going all the way back to the 1988 BMW M3 Sport Evolution and ending with the BMW M3 CRT in 2011. With the M4 having been on the market for a year now, BMW has pulled the covers off a new concept car that is the first special M4 model. The car is called the BMW Concept M4 GTS.

The M4 GTS has a lot of new tech that will debut later this year on production models. That tech includes water injection that is able to help the engine bump power and torque output in the M4 MotoGP Safety Car. OLED rear lights are also used on the M4 GTS.
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https://www.slashgear.com/bmw-concept-m4-gts-is-ready-for-the-track-14397122/