No turbocharging — Porsche adds 4.0-liter 394 hp six in Cayman, Boxster
(January 17, 2020) ATLANTA — Porsche is adding two new models to its mid-engine sports car range: the 718 Cayman GTS 4.0 and the 718 Boxster GTS 4.0. The new mid-engine sports cars are powered by a naturally-aspirated four-liter six-cylinder boxer engine developing 394 hp and 309 lb.-ft. of torque.