They all do have the system to some extent. Short trips clog the dpfs faster. Longer drives with some heat built up don't clog them as fast. As mentioned, idleing is the worst. When it regens you can help it by going for a spirited drive. The ones with the most problems drive it really easy and don't tow. I have less experience than some because all my newer diesels are "off road only.(deleted)" That's how my last three Cummins had almost a million miles combined with very few problems. The next Cummins is rumored to have less smog than ever.