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The Boxster GTS delivers the highest-spec naturally aspirated experience in the open-top Porsche lineup. The 981 GTS uses a 3.4L flat-six with 330 hp; the 718 Boxster GTS 4.0 (2021+) steps up to the naturally aspirated 4.0L unit with 394 hp — the same engine as the 718 Spyder and Cayman GT4.
Like the Cayman GTS 4.0, verify the model year when comparing listings: the "4.0" in the trim name separates the flat-six from the turbocharged flat-four GTS (2017–2020). Sport Chrono, PASM Sport, and the sport exhaust are standard on every GTS variant.