turbo down pipe

I have a brand new, still in original bubble wrap CTS turbo catless downpipe for the B58. Purchased from xph as combo deal on Black Friday, and decided to go high flow catted to avoid emissions headache. Willing to ship at buyer's expense. $300 obo

I like making things myself so I want to make my own downpipe rather than just buying one off the shelf. So first thing I need is a V band flange on the end of my downpipe that will mate up with the turbo's V band flange... and apparently its not just your average V band. For a start its got a...