Well I haven't followed a 335d yet, but I thought the latest BMW Euro IV compliant diesel engines with particulate filters had virtually zero "particle emissions", which means no black smoke. Hopefully a re-map won't have any negative affect on this.
I agree though, some other diesels around still pump out a lot of black smoke - seems to be the ones with down-turned tailpipes.
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2018 G30 520d M Sport with M Sport Plus - Mediterranean Blue
Previously: 2015 F32 430d M Sport, 2012 F10 520d M Sport, 2009 E92 320d M Sport, 2006 E92 335d, 2004 E60 530d, 2000 E39 525d, 1997 E39 523i
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