I was just explaining from my own experience why I expect the XV1 to perform that well after you questioned about it... Both are very good tuners with solid reputations and I too appreciate when they challenge themselves and push the limits (when it is done professionaly).
NOW BACK TO THE TOPIC:
A twin turbo V8 with same mods as I have would be in the 10's, when I would barely see 11's... So the S6 is a supercar in a sleeper sedan with great luxury. That is what most of us SHO owners (and MKS) appreciate.
So cheers!