This 2006 BMW E61 with a 3.0-litre diesel engine and manual transmission had already been tuned. The initial dyno run recorded 233 hp and 551 Nm. Compared with the factory figures of 230 hp and 500 Nm mentioned in the video, the increase was modest.

Inspection of the ECU file found shortcomings in the previous calibration and an active protection that made writing through OBD difficult. The control unit was removed and worked on at the bench, then a new calibration was installed. The EGR and DPF systems remained fitted to the car.

After the software changes, the dynamometer recorded 271 hp and 682 Nm. The clutch did not slip during the test, and the engine ran smoothly. The video also shows the power increase without pronounced black smoke.