Turbochip customized for overboost setup.
E39 525i, 530i 99-03 Turbo (M54B25 / M54B30) Tuning chip for overboost, remapped for a unique engine setup. The ECU needs to be sent to us for reprogramming.
E39 520i, 523i, 528i 96-99 Turbo (M52B20 / M52B25 / M52B28) Tuning chip for overboost, remapped for a unique engine setup. The ECU needs to be sent to us for reprogramming.