A 2013 Audi with a 3.0-litre engine was used to compare particle readings before and after Stage 1. The first reading, taken before tuning, was approximately 103,000–109,000. The car was then tested on a dynamometer and measured again; the reading after calibration was about 193,000–196,000. The video does not specify the instrument’s unit, so these figures refer only to the displayed readings.

The DPF and other emissions equipment remained fitted. After Stage 1, the dyno showed 261 hp and 570 Nm. Data logs showed DPF backpressure of approximately 470–484 mbar, and the filter was found to be partly restricted. Before tuning, the engine produced about 220–223 hp, while the technician cited 245 hp as the expected figure.

The technician estimated that power might reach approximately 281 hp after DPF regeneration or restoration of its operation. This was an estimate, not a dyno result. In this single test, the particle reading increased after calibration, so the result does not support a universal claim that tuning never affects particle readings. The video does not confirm a DPF repair or a roadworthiness inspection result.