Didnt mean to get arsey, just frustrated when questions are asked and nothing is really being asked?
Or if I was you I could get a pieces of string measure the diameter of the mid box pipe then ring up the seller or VAG for that matter and ask them "Mate whats the bore diameter."
You haven't said if you gonna be getting it done at garage or yourself either way I'm sure its something you can research on the net but I think its about 2" to 2.25" Either way its a an adaptor you will need and loads of decent garages will have one, but without you telling us what diameter you have how are we supposed to know?
Jay
Ashleys might have a bore size 2.5" same as Jetex if I remember rightly?