S8 5.2 FSI 450hp Stage 1 tuning

The Audi A8 S8 5.2 FSI 450hp produces 450 hp and 540 Nm as standard. The YASTUNING Stage 1 remap file takes it to 475 hp and 565 Nm, a gain of +25 hp and +25 Nm. Engine code BSM. ECU: Bosch MED9.1. The file is checksum-corrected and reviewed by an experienced calibrator within factory component tolerances.