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I keep track of my air intake temperature as it is related to the general under hood temperature. If it goes over 40°C on a regular basis I remove some of my grill blocking.
The reason (apart from having EGR, which adds heat and reduces the effectiveness of a WAI) is the battery.
Lead acid batteries don't last long if they get over 40 degrees.
My advice would be to choose the blocking in such a way that the 12V battery benefits from the air stream through the remaining unblocked parts.
And, of course, measure that under hood temperature. I used a cheap in/out digital thermometer before I got my UltraGauge.
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2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
  lifetime FE over 0.2 Gmeter or 0.13 Mmile.
For confirmation go to people just like you.
For education go to people unlike yourself.
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