The new sixth-generation Chevrolet Camaro offers a four-cylinder engine for the first time since the 1980s, and its 1LE handling package is now available for the V-6 model. The Ford Mustang, too, has turned to a turbo four in response to tightening fuel-economy and emissions standards. But lest you think the days of howling, rip-roaring V-8 muscle cars are fading, the 2017 Chevrolet Camaro ZL1 is here to change your mind.