The Porsche Cayman GTS 3.4i 340hp (2013 - 2015 ( 981 )) produces 340bhp and 380Nm in standard form. Our Stage 1 ECU tuning file raises output to 355bhp and 400Nm, a gain of 15bhp and 20Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.