Like any updated car whose changes stop short of a full redesign, the 2017 Porsche 911 Carrera bears the typical scars of midcycle fiddling. There are new headlights, new taillights, and a new touch-screen dashboard display. And that matters not one iota to us. In fact, those are but infinitesimal flickers in a grand night sky compared to the new 911’s biggest step forward, which requires you step back and peek under the engine covers of the Carrera and Carrera S. There, affixed to familiar flat-six engines, you’ll find twin turbochargers. Close the lids, and nary a script “Turbo” badge is visible.