I've got a 123d M-Sport as a daily and it's fantastic... think it's the same 2.0 Bi-Turbo as the D3. From what I've read; a map and DPF removal will boost things from c200bhp and c300lb/ft to c270bhp and c400lb/ft according to those on the BM forums. Should make it pretty urgent after that.
Cheers,
Grant