The 991.1 (2012-2015 / 2016 for GTS) uses naturally-aspirated 3.4L (Carrera) and 3.8L (S/GTS) engines. The 991.2 (2017-2018) replaced the Carrera and Carrera S engines with a 3.0L twin-turbo. …
991.1 vs 991.2 — turbo transition, with GT exceptions
Porsche 911 (991) · factory-spec