The increasingly rigorous regulations on pollutant emissions emitted by internal combustion engines have affected and will continue to affect the automotive industry strongly in the future. Moreover, although these regulations are leading to an ever-increasing thrust towards vehicle electrification, internal combustion engines will continue to play a leading role in the propulsion of passenger cars in the near future, especially in the world of high-performance engines. Therefore, it is important to understand how these requirements can be fulfilled. With regard to engines fueled by direct injection of gasoline into the combustion chamber, the so-called GDI (Gasoline Direct Injection) engines, from several years regulations have imposed limits on particulate emissions.