Got the car back from paint last night and went to install the trim to get it finished up and ran into a few problems:
1) The PDC sensors on the M5 bumper are different then those on the stock bumper so I have to order new ones. At $166.19 each from Tischer they are not cheap when you need 4 of them. Hopefully I can reuse the harness.
2) Brake ducts are not a direct install. You will have to custom mount them directly to the bumper and trim the back side so they match up the with existing standard e60 brake ducts.
3) I broke my matte black kidney grills taking them off the stock bumper so I had to order a new set.
4) I order the wrong glass for the mirrors so I have to exchange them for the correct ones, of course the glass for my mirrors cost 3x what the ones I bought cost
Here is a photo of how the car sits currently while it waits on the parts: