I'm as much a fan of the M3/4 as the next guy. These cars are after all BMW M cars. No doubt they are lighter and "sportier" than the M5/6 and if that's what you are looking for, the M3/4 still rules.
But there is no way the S55 puts out more torque than the S63Tu. As published the S63Tu puts out about 100lb-ft more. As dyno'ed there's an even greater difference.
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