Basically, everything that has a turbo 6 in BMW after 2011 has the twinscroll single turbocharger. So, 2007 - 2010 are twin turbos and 2011 and above are single turbos*
*There were some exceptions like the 135i M and I think the Z3 that used the older more potent N54 but BMW only made the exception for super sporty models.
*There were some exceptions like the 135i M and I think the Z3 that used the older more potent N54 but BMW only made the exception for super sporty models.