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On any of the engines I deal with (Cummins/Paccar/Caterpillar), intake heaters are only for cold startup. Extra heat for DPF is done with engine timing and closing the VGT for more back pressure, or with an flame thrower after the turbo on Caterpillars, never with increased intake heat. OEM priority is to keep the intake air as cool as possible to avoid excessive NOx production (I assume).
A bit of a side note. Unplugging the intake manifold temp sensor and installing a resistor to make the ECM think it's cold advances the timing on some engines and does wonders for mileage. I repeat: SOME engines. Cat engines: 100 ohms = indicated 7F. Cummins I'm not sure, but I could easily find out.
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