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I really think folks put a little too much importance on getting the coolant to temp very quickly. In the dark ages before FI, it was more important, but, still not as big a deal as it's made out to be.
A block heater is a good idea, but doing it any other way with rerouting exhaust through a heat exchanger is silly, IMO. And the idea about using electric resistance heating from the alternator is beyond silly. Just think about how much hp it would take to spin the alternator to provide this heating.
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