The owner of this twin-turbo BMW 535d brought it in to check the existing ECU software and improve engine performance. The dyno recorded 278 hp and 556 Nm, while the file check showed that the previous program had not substantially increased power. The exhaust-system configuration had already been modified before this visit.

After the ECU software was revised, the car produced approximately 328 hp and 688 Nm. A repeat dyno run recorded about 330 hp and 680 Nm. Power was checked with the six-speed automatic transmission, and no pronounced black smoke was visible during the test shown.

These figures apply to this vehicle and its already modified configuration. The previous file had changed DPF control settings; the video also describes further calibration of EGR and intake flaps. A dyno result alone does not establish that the exhaust system meets regulatory requirements.