This 2008 BMW 535d E60 with twin turbochargers had been extensively modified: the cooling and fuel systems were upgraded, a hybrid turbocharger was fitted, and the transmission was reprogrammed. The car had already been tuned elsewhere, but the previous calibration had not been dyno-tested. AutoChip’s first measurement recorded 425 hp and 827 Nm.

The engine software was then revised and the car made repeat dyno runs. The video title lists up to 436 hp and 863 Nm, while the narration also gives different repeat-run figures of approximately 426 hp and 853 Nm. These should therefore be treated as results from separate runs, not as one identical measurement.

The calibration took the modified vehicle setup and test conditions into account; ambient temperature was around 21°C. The video does not show a long-term road test or an assessment of fuel-system durability.