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You might could consider a coolant-based intake air heater. Both my Dodge Dakota's 4.7L V8 and my Dodge Magnum's 3.5L V6 have taken really well to heated intake air, it's a lot easier to plumb than trying to take heated air off exhaust parts, and I think that coolant does a better job of heating air than exhaust components do. I can get 90 to 100 F air going into the engine, when the outside temperature here is 0 to 10 F.
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