But only as a FYI to the OP, Cobb hasn't officially announced compatibility with the MY12 N55 engine, only for MY11. It seems to be hit or miss whether a particular MY12 N55 is supported yet, depending on production date (earlier the better).
Originally Posted by bear-avhistory
COBB or the JB4 are the two best choices.
See this thread in the E90Post N55 tuning forum for more information.
Last edited by Verts4Ever; 02-08-2013 at 05:23 PM.