by "pulse splitting" i mean that you would want want (for example, assuming that cylinders 1&2, 3&4, 5&6 are each along the same line if you know what i mean) cylinders 1 and 2 going to turbo number 1, cylinders 3 and 4 going to turbo 2, and cylinders 5 and 6 going to turbo 3. this would still be for a parallel setup.
so the exhaust pulses are "hitting" the turbo at even intervals,
like
bang . . bang . . bang . . bang (etc)
rather than
bang . bang . . . bang . bang . . (etc)
if this helps.
i still want to do it
i have thought about the sequential setup, and i think it is doable, (akin to twincharging) even though you would be better off just using a sensible sized turbo or living wth the lag.