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The Rx7 is a slightly different concept. The turbos are fed off all cylinders, having a buttterfly flap that switches between the two turbos varying the amount of exhaust flow to each one, thus spooling up the smaller turbo first, and then switching to push exhaust gas to the larger rear turbo. You can't run different sized turbos on individual or pairs of cylinders as the exhaust pulses will not be matched which will cause huge problems.
It is possible to run a sequential setup, but the gains would be negligable compared to the costs involved.
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