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This has limited applicability on a motor with crossover manifold and twin turbos. First, the crossover manifold combines pulses from both banks, which is what an X or H pipe does. The M550xi does not have the crossover manifold or at least earlier versions did not and many thought it sounded better than the M5. Second, twin turbos chew up the exhaust, changing its sound from that of a naturally aspirated V8. Third, the location of the X or H can make a difference and no one here has compared locations, again, to the extent it matters on a twin turbo motor with crossover manifolds. Fourth, free revs at idle are not that indicative of sound under load. The Mustangs were filmed under load as well, but they are naturally aspirated cars.
For these reasons, I would not make an exhaust decision based on X or H for the M5. Drive the car, listen under load and buy one you like.
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