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some data on what happens when you add an intercooler with no fuel adjustment. The more air you have in the cylinder the less heat that gets transferred to the cylinder wall when the fuel burns. Also with more excess air in the cylinder you have a leaner burn and the specific heat ratio of the combustion gases increase which further improves FE.
The same effect happens to a lesser degree with a cold air intake.
If its -60 degrees out I might consider warming the intake air, however I would have far more pressing concerns to deal with keeping my fuel from gelling up.
(From the Diesel Engine Reference Book, Second edition) Get a copy!!!
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