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I understand about the diesel EGR, it controls NOx emissions, but limits the life and efficiency of the engine. I have removed the EGR in every diesel I've owned. A coolant preheater is a good idea, but I suspect you will not get good performance from a simple coolant coil. I would explore real heat exchangers, I suspect there are some out there specifically for gas-liquid heat transfer in the proper size for your exhaust.
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I'm not coasting, I'm shifting slowly.
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