500 - 388hp Stage 1 tuning

The Mercedes-Benz GL 500 - 388hp produces 388 hp and 530 Nm as standard. The YASTUNING Stage 1 remap file takes it to 405 hp and 570 Nm, a gain of +17 hp and +40 Nm. Engine code M273.963. ECU: Bosch ME9.7. The file is checksum-corrected and reviewed by an experienced calibrator within factory component tolerances.