The Audi S5 2.9 V6 Bi-Turbo 355hp (F5 - MK1 - 2016 - 2018) produces 355bhp and 500Nm in standard form. Our Stage 1 ECU tuning file raises output to 400bhp and 550Nm, a gain of 45bhp and 50Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.