Please check out pictures on the left, the car in question together with the official emission test results.
Please find below the original description added from the owner of that car:
“Audi, 62% soot reduction, 10% less consumption
Hello Mr. Bieder,
I am full of enthusiasm about the ECO fuel-saving pin, the exhaust measurement from last week has showed a reduction of 62% compared with the previous year before the installation of the pin. The particulate emission has decreased from 0.82 k to 0.32 k without any changes in driving behavior or route profile. Fuel savings around 10%.