Yep. Defo a B6 - registered May 2003 on an 03 plate - 4.2 V8 not a 2.7 biturbo V6
Maybe the limiter was put in some cars and not others? Was running about 5.8k revs and doing 153mph and didn't want to go any more.
My dad had this haunted look on his face too, so I decided to slow down a bit. When I'm out on my own next I shall have to try it again