The BMW Concept M4 GTS is an M4 on steroids — and you'll be able to buy it - The Verge

BMW has a reputation of releasing uprated M3s over the years, going all the way back to the legendary E30 of the ’80s and early ’90s. With some rare, watered-down exceptions, though — the E46 ZCP and E92 Lime Rock Park Edition, for instance —... Like the last-generation M3 GTS, the Concept M4 GTS is focused on shaving weight and boosting power to help transform the car from a road machine into a road-track hybrid. It looks like BMW isn't talking exact numbers yet, but the GTS will get a boost over the standard M4's 425 horsepower thanks to water injection, which sprays a fine mist into the engine's intake manifold. (And, goodness, what a wing it is. ). The car is painted in a menacing, matte dark gray trimmed with orange, just to make sure everyone on the road realizes you're not driving a workaday M4. In back, the concept is fitted with the OLED taillights... Source: www.theverge.com