F Series Downpipes - Differences between BM-007 and BM-012

The F Series (1,2,3,4 Series) N55 cars all share the same downpipe.  When first introduced, the downpipes had a 3.5" v-band flange intlet on the turbocharger side.  On 07/13, BMW decided to change the downpipe.  This new downpipe featured a 4" v-band flange inlet instead.  Thus, the previous downpipes are not compatible with the new ones. 

Below is the breakdown on which downpipe to chose based on production date:

335i (U.S. Spec) - Up to 07/13 have the old downpipe (BM-EXH007)

                          After 07/13 have the new downpipe (BM-EXH012)

435i (U.S. Spec) - All 435i have the new downpipe (BM-EXH012)

M235i (U.S. Spec) - All M235i have the new downpipe (BM-EXH012)

M135i (European Spec) - Up to 07/13 have the old downpipe (BM-EXH007)

                                   After 07/13 have the new downpipe (BM-EXH-012)

IF THE VEHICLE IN QUESTION IS BUILT ON 07/13, IT CAN HAVE EITHER DOWNPIPE.  A VIN# CHECK SHOULD VERIFY WHICH DOWNPIPE IT IS.  TO BE ABSOLUTELY SURE, A VISUAL INSPECTION NEEDS TO BE DONE.  SINCE THE FACTORY PART# ON THE DOWNPIPES ARE DIFFICULT TO SEE, THE BEST WAY TO CHECK IS TO LOOK AT THE PART# ON THE BRACKET HOLDING THE DOWNPIPE.  THE OLDER DOWNPIPES HAVE 2 STUDS GOING INTO THE BRACKET AND ATTACHED BY 2 NUTS.  THE NEWER DOWNPIPE HAS 1 STUD ON TOP ATTACHED BY A NUT.  THE BOTTOM BRACKET IS ATTACHED WITH A BOLT, NOT A NUT.