All right, I promised, now I deliver.
Warm Air Intake on the 2010 Insight. I haven't tried it out yet but her ScanGauge was seeing 8°C or so when it's been about -2°C outside.
And I did the same for my 2000 Insight, although this only does half the airflow. The 2000 Insight has two air intake ports, one from the resonator on the left there and one where this vent is attached that goes directly to the outside down by the front bumper. I'm seeing IAT temperatures about 6°C higher than before, reading 17°C or 18°C on my OBDIIC&C gauge now instead of 12°C or so that I'd seen before.