What confuses me about all this is that I have had 4 BMW's since they introduced the th USB option and evertime they have given me a Y cable. They even threw one in with the MINI we have too. So I assumed they were part of the deal.
'03 E46 M3 SMG EB, '06 E90 320d LMB
'08 E82 125i M sport AW, '08 E88 135i M sport TiAg
'12 F21 M135i EB, '14 F22 M235i MW, 15 S1000RR SB,
'16 F48 X1 20d M sport AW, '16 F82 M4 SMB