S7 or RS7
The only guarantee is that both models will be competitive with the E63 or M5 and 518hp wouldn't cut it.
S6 450Hp
S7 475Hp
S8 500Hp
There is plenty of room to add more HP to the 4.0 more like
RS6 525Hp
RS7 550Hp
RS8 or A9/S9 600HP
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