The Porsche Panamera 4S 4.8i 420hp (970 - 2013 - 2016) produces 420bhp and 520Nm in standard form. Our Stage 1 ECU tuning file raises output to 440bhp and 540Nm, a gain of 20bhp and 20Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.