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If the intake heater is that much of an obstruction i'm surprised there isn't some kind of factory bypass, like a thermostat controlled air valve to go from a straight air intake, to a bypass with the heater in it, for how rarely it gets used.
At least after reading this I can no longer claim the owner of the 3/4 ton 4x4 Suburban with a 4cyl Isuzu diesel from the early 90's that I saw was flat out lying about getting 44mpg.
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