Have you disconnected it from the multi plug or unbolted it from the backbox?
There's a join just before the centre section, have decided to get it from there back. He said there will be a bit more work involved with the tailpipes I went for but getting it done for £450.
This sounds very interesting mate, I've also had my valves disconnected at the plug for months and no warning lights on, it does register faults which you can see with VCDS but nothing visible on the dash.
£450 is not a bad.
What tailpipe design you going for?