4.2 FSI 420hp Stage 1 tuning

The Audi R8 4.2 FSI 420hp produces 420 hp and 430 Nm as standard. The YASTUNING Stage 1 remap file takes it to 440 hp and 455 Nm, a gain of +20 hp and +25 Nm. Engine code BYH. ECU: Bosch MED9. The file is checksum-corrected and reviewed by an experienced calibrator within factory component tolerances.