Just changed my extractor and downpipe(plue the flex joint) about 2 months ago.
So I have the original GTI parts you're looking for, but your offer price is a bit too low.
PM me with an offer and let's see if we can make a deal ;-)
The McLaren MP4-12C has a lot to live up to, particularly since it was made by the very same company that gave us the McLaren F1 and subsequently the racing version of it, the F1 GTR.