EU4 doesn't require a DPF to meet the type approval requirements that applied to them when new - manufacturers were fitting them to test the technology, or in anticipation of tighter limits in some cities.
Smoke is only a proxy for particulate - it's an easy thing to test for and is part of the regulated roadworthiness directive requirements used at type approval to set a smoke limit and put a value on the VIN plate, but if you test for particulate itself (which can be done but the kit isn't there yet) the difference without a DPF is many magnitudes higher.
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===SOLD===2002 Audi S8 D2 Final Edition (yes, really) in Avus Silver with purple extended leather===SOLD===
2011 S5 Sportback in Phantom Black with black Super Sports leather, 9x20s, tech pack high, adaptive xenon plus, intelligent key, memory seats pack, sunroof, B&O, Audi Drive Select & quattro Sports Diff, DAB, parking system plus
2015 VW Golf GTI Performance Pack in Carbon Grey with black Vienna leather, tech pack (Discovery Pro nav & Dynaudio), DCC, factory towbar and retrofit RVC
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