Perhaps an M7 could have a hybrid drivetrain like the i8.
S63 Twin Turbo V8 (550Hp/500lbft) mated to the same electric motor from the i8 (129Hp/184lbft). So about 680Hp and 685lbft...mingle that with some of the CFRP/CF pieces that BMW is using and VOILA! M7
This of course would be the first xDrive M sedan...but with that much torque I don't see why not.
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