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I'd take the whole exchanger out of the exhaust stream after it has warmed up; no restriction, and that's gotta be an awful tough life for an exchanger that is continuously exposed.
I've been thinking of a simple butterfly valve on the exhaust that basically traps heat in the exhaust and is, well, just another EGR that traps heat in the cylinder but without looping it around in exterior (to the cylinder) plumbing. Thing is, much/any more EGR at cold probably isn't tolerable...
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