I know the 5.2 v10 engine in the C6 S6 is the same as the lambo engine apart from bolt I’m stuff like the inlet manifold and a few other bits.

what I find mad is the rs6 got two turbochargers, making it more tunable than the lambo, I have a mate with a 820bhp rs6 and got it just to beat a rival who upped his game and got a lambo