US Spec 335d E90 LC1
DPF: 18 30 8 512 290 OR 18 30 7 808 655
Entry pipe ring 18 20 7 793 677
Exit pipe gasket 18 30 7 812 171
EU Spec E90 LC1 335d
DPF: 18 30 8 508 523
Entry pipe ring 18 20 7 793 677
Exit pipe ring 18 30 7 793 766 (inside diameter 76mm)
It will need some considerable effort to fit our downpipe.
The USA spec 335d has a two holes flange while the EU spec has a simple pipe.
You will be missing a lot of the sensor bungs...