Not without a properly funtioning DPF, that would be almost impossible on a diesel, since a CC alone is not enough and an EGR is about NOx not smoke... but the combination of fresh clean (ish) oil and filter, new EGR/ASV and new exhaust seems to be currently much cleaner, so I do think the old silencers were a contributing factor, although since after the service and new valves, I haven't seen much in the way of smoke on the overun neither.
Though I intend to also change the membrane on the so miscalled CCV, on the rocker cover, and possibly fit some sort of aftermarket catch can to keep the oil fumes in the intake down, so as to reduce gummy build up in those valves. The full hog would be a new turbo one day too, since that throws back some oil as well, even if it's OK, like mine. It's pretty normal to see oil dripping out the ASV on these engines, which I did when I changed the valves. Fortunately it's dead easy and quick to whip off the EGR for a clean on this engine, so I might just continue with that for a while.