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Simple - Get sheet metal to block off the front openings.
Remove the air intake ducting.
That should theoretically do both, warm the engine faster by removing cold air to the radiator, and since there is no cold air flow from the front, the air intake with no ducting will be sucking in warm air (at the expense of making the filter dirty faster - nothing a good clean would not solve).
DWL I've just started, so as I climb the slight hill, I'll sit in 2nd gear up the street, which isn't too noisy (i.e. about 2500RPM).
Instrumentation is first on the list though, no changes are worth making without data to validate the effectiveness.
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