Well i got a friend that has a 320D, he got the swirlflaps removed the same day his warranty was out. That was after 2 years and 70.000km. Today the car has run 600.000km, yes thats 600.000km and its still running perfect! Yes his car does have DPF, and that didnt need to be changed before just now. He changed it 2 weeks ago when he hit 600.000km.
Well serviced and looked out for. The car still runs like "new"..