This BMW F11 with a 3.0-litre diesel engine was first checked with diagnostic equipment and a smoke meter. The quoted factory output is 245 hp and 520 Nm. The diagnostic scan showed several faults, including entries related to the emissions system. The intake manifold had been cleaned previously, and the owner asked to keep the swirl flaps.

Work and dyno results

The video shows removal of the diesel particulate filter, changes to EGR control, and software work on both the engine and automatic transmission. The car was then tested on the dyno. Repeat runs produced approximately 292–294 hp and 631–641 Nm, with some variation as the engine warmed up.

The smoke coefficient reported in the video was about 0.03 before the work and 0.08 afterwards; no unit is stated. These figures describe the readings shown during this specific vehicle test.