The weather is rapidly getting colder, so I decided to do a proper warm air intake. The Insight's intake diameter is 2", and it's surprisingly hard to find 2" foil ducting, but
I came across some on an RV supply website.
Foil ducting:
Stock ducting removed:
New foil duct in place:
Drawing air from behind the cat:
Weather is in the 50's during the day, and dropping to mid 30's at night right now. I'm just able to get away with a 75% grille block and still get up the mountains around here without running the radiator fan too much.
In the mornings I'd see intake temperatures of ~16c after the car was fully warm (outside air temperature ~5c/40f), with the stock intake pulling air from behind the radiator. After my WAI, this is what I'm seeing:
Flat terrain:
Temperature at the top of the tallest hill in my usual drive:
