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Exhaust is hot, but is it hot enough? I'm not smart enough to have that kind of math in my head, but if you want decent power out of a Stirling, it's all about the delta-T. Lower temperatures require larger heat exchangers, larger displacer pistons, and generally lower revs. You might wind up going backward in terms of efficiency.
It might be easier to just stick a hundred Seebeck devices onto the exhaust pipe and obviate your alternator.
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Lead or follow. Either is fine.
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