Actually,there is no exhaust brake on the 6. 7. The VG turbo can act as an exhaust brake, you pay extra for the software and the switch.
I am waiting to see if my 2007. 5 will have the exhaust brake activated. I did not have the NEN sales code on my order. I was told the dealer added the program and switch. Of course, at an uknown cost at the time I was investigating the issue. Fred