OK, my Brera has just been for it's MOT - '07 2.4JTDM, 64k and remap DPF removal/EGR delete (remap by Alfatune, DPF replaced by straight-through pipe at MCLennans Edinburgh).
It passed on the smoke emissions, but only just! A mean value of 2.38 with a peak at 2.59 (current limit 3.0)!
Last year, with no mods, it sailed through with 0.04!
The tester said although it passed today, next year there could be a problem as the limits will probably be reduced. Surely new rules will be for newer cars, and as an '07, mine only has to be Euro IV compliant?
I also have white smoke on a cold start-up, and a puff of black on hard acceleration. In addition, a couple of Injector correction values are a bit wacky.
I'm starting to think at least one of my injectors could be duff - would that cause some of the issues above? I always use V-Power and have used BG24 on a couple of occasions..