With more than 600bhp the M760Li xDrive is the most powerful production BMW ever. For the time being it's also the fastest accelerating road car BMW has ever built. Subscribe now: http://smarturl.it/autocar
But how does it compare to Porsche's own big power luxury machine, the Panamera Turbo? We drive both cars on the road before heading to the test track where we find out which one is faster in a drag race.
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