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All but a tiny bit, just enough to idle. Then less and less the more power you wanted to make. Sort of opposite how a normal throttle works. But if it were not in the intake side it wouldn't be wasting energy making vacuum, or much exhaust for that matter at light loads. Basically let 90% EGR turn a 2000 cc motor into a 200cc motor until it needs it. I assume this much EGR has been tried and combustion fails at some point at least when applied to current conventional bore, stroke, valves, compression, etc.
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