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It simply catches the black puff of dust coming from the engine and then regenerates, super heats the crap and then blasts it out at a later date in smaller burnt bits.... I. E, still poluting the planetok you knew this question was coming, right?
what is the point in the DPF if a car will pass the emissions test without one? what does DPF actually do other than cause problems and additional emissions that a car without DPF wont generate?