“If everything is under control, you’re not going fast enough,” said renowned racer Mario Andretti—but that was before he had a chance to drive any of the high-powered performers that debuted in 2015. More than ever, marques are tapping new technologies to find parity in horsepower and handling while blowing past previous boundaries. From a 900 hp hybrid to a ridiculously fast and furious Fiat, the following two-seat sensations not only represent this new automotive age, but have proven to be among the most popular sports cars co…